Overview
Analysis
Claude Fable 5 vs GPT-5.5 vs Gemini 3.1 Pro Preview: side-by-side summary
Claude Fable 5, GPT-5.5, and Gemini 3.1 Pro Preview are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.
Claude Fable 5, from Anthropic, has a 1,000,000-token context window and is priced at $10/M tokens input, $50/M tokens output on OpenRouter.
GPT-5.5, from OpenAI, has a 1,050,000-token context window and is priced at $5/M tokens input, $30/M tokens output on OpenRouter.
Gemini 3.1 Pro Preview, from Google, has a 1,048,576-token context window and is priced at $2/M tokens input, $12/M tokens output on OpenRouter.
| Attribute | Claude Fable 5 | GPT-5.5 | Gemini 3.1 Pro Preview |
|---|---|---|---|
| Context window | 1,000,000 tokens | 1,050,000 tokens | 1,048,576 tokens |
| Price | $10/M tokens input, $50/M tokens output | $5/M tokens input, $30/M tokens output | $2/M tokens input, $12/M tokens output |
| Provided by | Anthropic | OpenAI | |
| Model page | Claude Fable 5 model details, providers and pricing | GPT-5.5 model details, providers and pricing | Gemini 3.1 Pro Preview model details, providers and pricing |