Claude Fable 5.1 vs Gemini 3.1 Pro Preview Custom Tools vs GPT-6 Astra

Compare Claude Fable 5.1 from Anthropic, Gemini 3.1 Pro Preview Custom Tools from Google, and GPT-6 Astra from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access all 3 models and hundreds of others through the OpenRouter API.

Claude Fable 5.1 vs Gemini 3.1 Pro Preview Custom Tools vs GPT-6 Astra: side-by-side summary

Claude Fable 5.1, Gemini 3.1 Pro Preview Custom Tools, and GPT-6 Astra are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Claude Fable 5.1, from Anthropic, has a 1,000,000-token context window and is priced at $10/M tokens input, $50/M tokens output on OpenRouter.

Gemini 3.1 Pro Preview Custom Tools, from Google, has a 1,048,576-token context window and is priced at $2/M tokens input, $12/M tokens output on OpenRouter.

GPT-6 Astra, from OpenAI, has a 1,050,000-token context window and is priced at $10/M tokens input, $50/M tokens output on OpenRouter.

Context window: Claude Fable 5.1: 1,000,000 tokens
Gemini 3.1 Pro Preview Custom Tools: 1,048,576 tokens
GPT-6 Astra: 1,050,000 tokens
Price: Claude Fable 5.1: $10/M tokens input, $50/M tokens output
Gemini 3.1 Pro Preview Custom Tools: $2/M tokens input, $12/M tokens output
GPT-6 Astra: $10/M tokens input, $50/M tokens output
Provided by: Claude Fable 5.1: Anthropic
Gemini 3.1 Pro Preview Custom Tools: Google
GPT-6 Astra: OpenAI

Claude Fable 5.1 vs Gemini 3.1 Pro Preview Custom Tools vs GPT-6 Astra

Compare Claude Fable 5.1 from Anthropic, Gemini 3.1 Pro Preview Custom Tools from Google, and GPT-6 Astra from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access all 3 models and hundreds of others through the OpenRouter API.