# Compare AI models

Canonical HTML page: [Compare AI models](<https://impossibl.com/compare>)
Markdown alternative: [Compare AI models as Markdown](<https://impossibl.com/compare.md>)

Select two or three available models from the directory to compare their specifications and API costs. Compare input and output prices, context windows, supported inputs, and tool calling; use a shared workload for compatible text or embedding models.

[Choose models from the directory](<https://impossibl.com/models.md>). Comparison paths contain two or three consecutive creator/model identifiers; append .md for Markdown.

## Explore model comparisons

- [Claude Opus 5 vs GPT-6 Astra](<https://impossibl.com/compare/anthropic/claude-opus-5/openai/gpt-6-astra.md>); [HTML comparison](<https://impossibl.com/compare/anthropic/claude-opus-5/openai/gpt-6-astra>)
- [Gemini 3.8 Flash vs GPT-6 Astra](<https://impossibl.com/compare/google/gemini-3.8-flash/openai/gpt-6-astra.md>); [HTML comparison](<https://impossibl.com/compare/google/gemini-3.8-flash/openai/gpt-6-astra>)
- [GPT-6 Astra vs Grok 4.6](<https://impossibl.com/compare/openai/gpt-6-astra/xai/grok-4.6.md>); [HTML comparison](<https://impossibl.com/compare/openai/gpt-6-astra/xai/grok-4.6>)
- [Llama 3.3 70B Instruct vs GPT-6 Astra](<https://impossibl.com/compare/meta/llama-3.3-70b/openai/gpt-6-astra.md>); [HTML comparison](<https://impossibl.com/compare/meta/llama-3.3-70b/openai/gpt-6-astra>)
- [Mistral Large 3 vs GPT-6 Astra](<https://impossibl.com/compare/mistral/mistral-large-3/openai/gpt-6-astra.md>); [HTML comparison](<https://impossibl.com/compare/mistral/mistral-large-3/openai/gpt-6-astra>)
- [Phi-4 vs GPT-6 Astra](<https://impossibl.com/compare/microsoft/phi-4/openai/gpt-6-astra.md>); [HTML comparison](<https://impossibl.com/compare/microsoft/phi-4/openai/gpt-6-astra>)

## Sources and related links

Prices, capabilities, limits, and availability describe the public Impossibl API offering. An unpublished fact is unknown; a published zero price is zero. Compare matching billing units and check context tiers before estimating costs.

- [Public Impossibl model catalog](<https://api.impossibl.com/v1/models>)
- [Full model directory as JSON](<https://impossibl.com/models.json>)
- [Model directory as Markdown](<https://impossibl.com/models.md>)
- [API quickstart](<https://impossibl.com/docs/agent-quickstart>)
- [Model documentation](<https://impossibl.com/docs/models>)