Selecting an LLM

Choose the right AI model for your Playlab project

🎉 NEW: Claude Sonnet 4.6, Claude Opus 4.6, Gemini 3.1 Pro, GPT 5.2, and Mistral Large 3 are now available in Playlab!

New Models Added Regularly! We’re constantly adding and updating models to give Playlabbers access to the latest AI capabilities. Our goal is to provide more open weight models and eventually open source models to give you maximum flexibility and control over your applications.

What is this feature?

You can now build on top of even more LLMs in Playlab! There are now over 20 available AI models for you to build your Playlab apps on top of. We will try our best to always provide the latest models for you to build on top of.

Changing the LLM may impact the performance of your app.

Rationale for the feature

This feature allows Playlab users to experiment with and leverage the unique strengths of various AI models from different providers all within Playlab.

As you build, you might find that certain models perform better at different tasks. This will allow Playlab users to select the model that fits their needs better. The more available models, the more likely you are to find one that meets your needs. We believe that Playlabbers should have access to frontier models as we build in community.

Understanding Model Types

Before selecting a model, it’s helpful to understand the different categories of AI models available:

Frontier Models	Open Weight Models	Open Source Models
Cutting-edge, proprietary models developed by major AI companies	Models with publicly available parameters (weights) that can be downloaded and run independently	Fully open models where both weights and training code are publicly available
Typically offer the most advanced capabilities and are continuously updated with the latest research breakthroughs	While training code may not be available, you have more control over deployment and customization	Offer maximum transparency and customization potential
Examples: Claude Opus 4.6, Claude 4.6 models, GPT 5.2, ChatGPT 5.1, Gemini 3.1 Pro, Gemini models	Examples: Llama models, DeepSeek R1, GPT OSS models, Kimi K2.5, Qwen 3, Mistral Large 3	Coming soon!

How do I access these models?

1. Click the LLM selector

   On the top left click the LLM. (By default it will be Claude Sonnet 4.6)

   
2. Choose your model

   From the menu, select which LLM you want to build on top of. You can read more about available models below in greater detail.

3. Build and Test

   See how the model you chose impacts your app. Continue trying out different models to find the “best” fit for your app.

Available Models

Now that you know how to select models, here are the currently available models with their strengths and tradeoffs:

Claude Opus 4.6 (Anthropic)

Frontier Model

Description: The most powerful and intelligent model in the Claude family. Designed for the most demanding tasks requiring exceptional reasoning, creativity, and nuanced understanding.

Plus Strengths: Unmatched intelligence and reasoning depth. Superior performance on complex multi-step problems. Exceptional creative and analytical capabilities. Best-in-class instruction following and nuance understanding.

Minus Trade Offs: Slower response times and higher cost. Best reserved for tasks that truly require maximum capability.

Claude Sonnet 4.6 (Anthropic)

Frontier Model | Default

Description: Latest and most advanced version of Claude Sonnet. The new default model for all Playlab apps, offering breakthrough performance for everyday use.

Plus Strengths: State-of-the-art intelligence and reasoning. Superior instruction following and nuance understanding. Exceptional balance of speed and capability. Best-in-class for most applications requiring high quality output.

Minus Trade Offs: More expensive than smaller models. May be more than needed for very simple tasks.

Claude Opus 4.5 (Anthropic)

Frontier Model

Description: Highly capable model designed for demanding tasks requiring exceptional reasoning, creativity, and nuanced understanding.

Plus Strengths: Excellent intelligence and reasoning depth. Strong performance on complex multi-step problems. Great creative and analytical capabilities.

Minus Trade Offs: Slower response times and higher cost. Superseded by Claude Opus 4.6 for maximum capability.

Claude Sonnet 4.5 (Anthropic)

Frontier Model

Description: Highly efficient model for everyday use with strong performance across a wide range of tasks.

Plus Strengths: Excellent intelligence and reasoning. Strong instruction following. Good balance of speed and capability.

Minus Trade Offs: Superseded by Claude Sonnet 4.6 for most use cases. More expensive than smaller models.

Claude Haiku 4.5 (Anthropic)

Frontier Model

Description: Latest and fastest model in the Claude family, optimized for speed and efficiency on everyday tasks.

Plus Strengths: Fastest response times among Claude models. Excellent for quick questions and lightweight tasks. Strong performance for its speed tier.

Minus Trade Offs: Less capable than Sonnet or Opus models. May struggle with complex multi-step reasoning and advanced analysis.

Claude 4 Sonnet (Reasoning) (Anthropic)

Frontier Model

Description: Work through difficult problems using careful, step-by-step reasoning.

Plus Strengths: Exceptional step by step reasoning capabilities. Stronger at math and coding. Very good at explaining thought process

Minus Trade Offs: Slower response times. Not as optimized for creative tasks. Consider Claude Sonnet 4.6 or Claude Opus 4.6 for better overall performance.

GPT 5.2 (OpenAI)

Frontier Model

Description: OpenAI’s latest flagship model with breakthrough capabilities in reasoning, creativity, and multimodal understanding.

Plus Strengths: State-of-the-art performance across all domains. Exceptional reasoning and problem-solving. Advanced creative capabilities. Superior instruction following and nuance understanding.

Minus Trade Offs: Slower response times and higher cost. May be unnecessary for simple tasks. Premium pricing for cutting-edge capabilities.

ChatGPT 5.1 (OpenAI)

Frontier Model

Description: OpenAI’s latest conversational AI model optimized for natural dialogue, helpfulness, and versatile task completion.

Plus Strengths: Exceptional conversational fluency and natural dialogue. Strong general-purpose capabilities across diverse tasks. Improved safety and helpfulness. Excellent at explaining complex topics accessibly.

Minus Trade Offs: May be slower than lightweight models. Premium pricing for cutting-edge conversational capabilities.

GPT-5 Mini (OpenAI)

Frontier Model

Description: A balanced version of GPT-5 optimized for everyday use with improved speed and efficiency.

Plus Strengths: Excellent balance of GPT-5 capabilities with faster response times. Cost-effective for regular applications. Strong performance across most tasks without premium overhead.

Minus Trade Offs: Slightly reduced capabilities compared to GPT 5.2. May not excel at the most complex reasoning challenges requiring maximum model capacity.

GPT OSS 120B (OpenAI)

Open Weight Model

Description: OpenAI’s large open weight model.

Plus Strengths: Open weights allow for customization and local deployment. Strong general capabilities. Good for research and experimentation.

Minus Trade Offs: Requires significant computational resources. May not match latest frontier model performance.

Gemini 3.1 Pro (Google)

Frontier Model

Description: Google’s latest and most advanced model featuring superior multimodal capabilities, enhanced reasoning, and improved creative performance.

Plus Strengths: State-of-the-art multimodal understanding. Exceptional reasoning and problem-solving. Superior performance on complex analytical tasks. Enhanced creative and coding capabilities. Best-in-class for applications requiring advanced Google AI.

Minus Trade Offs: Slower response times compared to Flash models. Higher cost for premium capabilities. May be unnecessary for simple tasks.

Gemini 3 Flash (Google)

Frontier Model

Description: Google’s latest fast model optimized for quick response times with strong general capabilities.

Plus Strengths: Extremely fast response times. Strong general-purpose performance. Good for simple instruction following and high volume tasks.

Minus Trade Offs: Not ideal for multi-step problem solving or complex instruction following. May miss nuance in instructions.

Gemini 3 Pro (Google)

Frontier Model

Description: Advanced Google model featuring strong multimodal capabilities, reasoning, and creative performance.

Plus Strengths: Strong multimodal understanding. Good reasoning and problem-solving. Solid performance on analytical tasks.

Minus Trade Offs: Slower response times compared to Flash models. Superseded by Gemini 3.1 Pro for most use cases.

Gemini 2.5 Pro (Google)

Frontier Model

Description: Google’s powerful thinking model with maximum response accuracy and state-of-the-art performance

Plus Strengths: Exceptional reasoning capabilities. High accuracy on complex tasks. Advanced problem-solving abilities.

Minus Trade Offs: Slower response times. Higher computational cost. Superseded by Gemini 3.1 Pro for most use cases.

Gemini 2.5 Flash (Google)

Frontier Model

Description: General purpose model optimized for fast response times.

Plus Strengths: Extremely fast response times. Good for simple instruction following and high volume tasks

Minus Trade Offs: Not ideal for multi-step problem solving or complex instruction following. Superseded by Gemini 3 Flash for most use cases.

Mistral Large 3 (Mistral)

Open Weight Model

Description: Mistral’s latest large language model with strong reasoning and multilingual capabilities.

Plus Strengths: Strong reasoning and analytical capabilities. Excellent multilingual support. Open weight flexibility for customization and deployment.

Minus Trade Offs: May not match top frontier models on the most demanding tasks. Performance varies by domain.

Kimi K2.5 (Moonshot)

Open Weight Model

Description: Advanced open weight model that excels in using tools.

Plus Strengths: Excellent tool usage capabilities. Good for applications requiring API integrations. Strong technical reasoning.

Minus Trade Offs: May be specialized for tool use rather than general conversation. Performance varies on creative tasks.

DeepSeek R1 (DeepSeek)

Open Weight Model

Description: Open-source model designed for efficiency.

Plus Strengths: Cost-effective and efficient. Good for applications where budget is a primary concern. Open-source flexibility.

Minus Trade Offs: May not match performance of frontier models on complex tasks. Limited compared to more advanced models.

Llama 4 Maverick (Meta)

Open Weight Model

Description: Advanced open-weight model for reasoning, math, and general knowledge.

Plus Strengths: Improved reasoning capabilities over Llama 3.3. Strong performance in general knowledge tasks. Open weight benefits.

Minus Trade Offs: Not as fast as smaller models. May require more specific prompting for best results.

Llama 4 Scout (Meta)

Open Weight Model

Description: Powerful for multi-document analysis, cross-lingual understanding, and context-aware reasoning.

Plus Strengths: Excellent at analyzing multiple documents simultaneously. Strong cross-lingual capabilities. Advanced contextual understanding.

Minus Trade Offs: May be slower for simple tasks. Specialized for document analysis rather than general usage.

Llama 3.3 70B Instruct (Meta)

Open Weight Model

Description: Advanced model for reasoning, math, and general knowledge.

Plus Strengths: Strong general well balanced use cases. Performs well in math. Effective at following clear instructions. Open weight flexibility.

Minus Trade Offs: Slower than smaller models. Does not follow instructions as well as Claude/GPT models.

Qwen 3 (Alibaba)

Open Weight Model

Description: Advanced open weight model with strong multimodal and multilingual capabilities.

Plus Strengths: Excellent multilingual support. Strong performance on reasoning tasks. Good balance of performance and efficiency. Open weight flexibility.

Minus Trade Offs: May not match frontier model performance on highly specialized tasks. Performance varies depending on language and domain.

Tips for Selecting the Right Model

Selecting can be tricky. That’s why we encourage you to play and experiment as you build to find the model that is best fit for your context.

Selection Considerations

Ask yourself what is an ideal response time for your app?

This will allow you to pick larger or smaller models that meet those needs. Claude Sonnet 4.6, GPT-5 Mini, and ChatGPT 5.1 offer excellent balance, while Claude Opus 4.6, Gemini 3.1 Pro, and GPT 5.2 prioritize quality over speed. Claude Haiku 4.5, Gemini 3 Flash, and Gemini 2.5 Flash excel at speed for simple tasks.

Identify what complexity level is your task?

For simple Q&A or content generation, lighter models like Claude Haiku 4.5, Gemini 3 Flash, or Gemini 2.5 Flash may suffice. For balanced everyday tasks, Claude Sonnet 4.6, GPT-5 Mini, or ChatGPT 5.1 are ideal. For the most complex multi-step reasoning, choose Claude Opus 4.6, GPT 5.2, Gemini 3.1 Pro, or Gemini 2.5 Pro.

What is the level of accuracy you are requiring of your app?

Critical accuracy use cases like data analysis, or HR operations might require Claude Opus 4.6, GPT 5.2, Gemini 3.1 Pro, or other powerful models even if they’re slower. Use cases that require creativity or open ended responses work well with GPT 5.2, GPT-5 Mini, ChatGPT 5.1, Claude Sonnet 4.6, or creative-focused models.

Do you need open weights or source code access?

If you need model customization, local deployment, or transparency into model operations, consider open weight models like Llama 4 series, Qwen 3, DeepSeek R1, Mistral Large 3, or GPT OSS 120B. For maximum performance and latest capabilities, frontier models like Claude Opus 4.6, GPT 5.2, ChatGPT 5.1, Claude Sonnet 4.6, or Gemini 3.1 Pro are typically best. Consider your long-term deployment and customization needs when choosing between proprietary and open models.

Best Practices

Try to match your model with your use case:

Everyday applications: Claude Sonnet 4.6, Claude Haiku 4.5, GPT-5 Mini, or ChatGPT 5.1 provide the best balance of performance and efficiency. Critical/Complex applications: Claude Opus 4.6, GPT 5.2, Gemini 3.1 Pro, or Gemini 2.5 Pro for highest accuracy and reasoning capability. Creative applications: GPT 5.2, GPT-5 Mini, ChatGPT 5.1, or Claude Sonnet 4.6 for creative tasks. Problem-solving tools: Claude Opus 4.6, Claude Sonnet 4.6, GPT 5.2, Gemini 3.1 Pro, or Llama 4 Maverick. Document analysis: Claude Opus 4.6, Claude Sonnet 4.6, or Llama 4 Scout for multi-document or cross-lingual analysis. Technical/Coding tasks: Claude Opus 4.6, Claude Sonnet 4.6, GPT 5.2, or Kimi K2.5 for tool usage. Educational explanation: Claude Sonnet 4.6, GPT-5 Mini, ChatGPT 5.1, Llama 3.3 70B Instruct, Llama 4 Maverick, or those with strong explanatory capabilities. High-volume applications: Balance quality with speed using Claude Sonnet 4.6, Claude Haiku 4.5, Gemini 3 Flash, or GPT-5 Mini. Budget-conscious applications: Claude Haiku 4.5, Qwen 3, DeepSeek R1, Mistral Large 3, or other open weight models for cost-effective solutions. Research/Experimentation: Open weight models like Llama 4 series, Qwen 3, Mistral Large 3, or GPT OSS 120B for flexibility.

Test out multiple models for apps that you are building:

Changing a model may change performance of an app in Playlab. Test multiple models before finalizing, as performance can vary significantly on your specific tasks. Implement A/B testing as you’re building and testing to continually evaluate model performance. Consider starting with Claude Sonnet 4.6 or GPT-5 Mini as your baseline for most applications. Test both frontier and open weight models to find the best fit for your needs.

Additional best practices:

We recommend that you remix apps as you’re experimenting to not impact the original app. You can review activity to see how multiple models handle similar tasks. If you’re building a suite of apps we recommend you use faster models like Claude Haiku 4.5 for simple queries and reserve powerful models like Claude Opus 4.6, Claude Sonnet 4.6, GPT 5.2, Gemini 3.1 Pro, or Gemini 2.5 Pro for complex tasks. Consider cost implications, as newer frontier models like Claude Opus 4.6, Claude Sonnet 4.6, ChatGPT 5.1, Gemini 3.1 Pro, and GPT 5.2 may be more expensive but offer better performance. For production apps requiring customization, evaluate open weight models like Qwen 3, Mistral Large 3, and Kimi K2.5 alongside frontier options. Keep track of which models work best for your specific use cases to build your own selection guidelines.

FAQ

Will switching models affect my existing app?

Yes, changing the LLM model can impact the performance of your app. Different models have different strengths and trade-offs, so it’s important to test your app with the new model before finalizing the change.

How do I know which model is best for my specific use case?

We recommend experimenting with different models for your specific use case. Consider factors like response time requirements, complexity level of tasks, accuracy needs, and whether you need open weights. You can implement A/B testing to evaluate model performance. For most applications, Claude Sonnet 4.6 or GPT-5 Mini are great starting points.

What is the default model for new apps?

Claude Sonnet 4.6 is the default model for new apps in Playlab. It offers the best balance of intelligence, speed, and capability for most applications.

When should I choose Claude Opus 4.6 vs Claude Sonnet 4.6 vs Claude Haiku 4.5?

Choose Claude Opus 4.6 for the most demanding tasks requiring maximum intelligence, reasoning depth, and nuanced understanding. It’s the most powerful model in the Claude family. Choose Claude Sonnet 4.6 for most applications where you need excellent intelligence with a good balance of performance and efficiency — it’s the new default for all Playlab apps. Choose Claude Haiku 4.5 for fast, lightweight tasks requiring quick response times.

What's the difference between Gemini 3.1 Pro and Gemini 3 Pro?

Gemini 3.1 Pro is Google’s latest and most advanced model, building on Gemini 3 Pro with improved multimodal capabilities, stronger reasoning, and enhanced performance. Gemini 3 Pro remains available but is generally superseded by Gemini 3.1 Pro for most use cases.

When should I use ChatGPT 5.1?

ChatGPT 5.1 is ideal for applications requiring exceptional conversational fluency and natural dialogue. It excels at general-purpose tasks, explaining complex topics accessibly, and providing helpful, safe responses. Consider it for chatbots, customer service applications, educational tools, and any use case where natural conversation is a priority.

What's the difference between GPT 5.2, GPT-5 Mini, and ChatGPT 5.1?

GPT 5.2 is OpenAI’s most powerful model with breakthrough capabilities across all domains. GPT-5 Mini provides a balanced option with faster response times and better cost efficiency. ChatGPT 5.1 is specifically optimized for natural conversational dialogue and helpfulness. Choose based on whether you need maximum capability (GPT 5.2), balanced performance (GPT-5 Mini), or conversational excellence (ChatGPT 5.1).

What's the difference between frontier, open weight, and open source models?

Frontier models are cutting-edge proprietary models with the latest capabilities but require API access. Open weight models have publicly available parameters, allowing more control and customization. Open source models provide both weights and training code. Choose based on your needs for performance vs. customization and transparency.

When should I consider open weight models like Llama 4, Qwen 3, Mistral Large 3, or DeepSeek R1?

Consider open weight models when you need model customization, local deployment, cost control for high-volume applications, or transparency into model operations. They’re also great for research and experimentation. However, frontier models typically offer better performance for most production applications.

We Want Your Feedback!

Have you tried building with different LLM models? We’d love to hear about your experience with the new models and which ones work best for your use cases!

Contact us at [e-mail]

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Last updated: 02/28/2026