Claude Fable 5 vs Gemini 3.1 Pro
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Claude Fable 5
Anthropic · Jun 2026
The first GA model of Anthropic's Mythos class — a tier above Opus — and the current SWE-bench Verified leader, at $10/$50 per 1M tokens.
Gemini 3.1 Pro
Google · Mar 2026
Google's flagship with the industry's largest context window — 2M tokens — and frontier multimodal reasoning at $2/$12.
The verdict
Claude Fable 5 wins 1 of the 1 benchmarks these models share, against 0 for Gemini 3.1 Pro. On price the gap is dramatic: Gemini 3.1 Pro works out roughly 4.4x cheaper per blended million tokens. Gemini 3.1 Pro also takes 2M of context versus 1M for Claude Fable 5.
Benchmark head-to-head 1–0
Specs & pricing
| Claude Fable 5 | Gemini 3.1 Pro | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $10 | $2 |
| Output price / 1M | $50 | $12 |
| Context window | 1M | 2M |
| Max output | 128K | 66K |
| Open weights | no | no |
| Reasoning model | yes | yes |
| Multimodal input | text, image | text, image, audio, video |
| Knowledge cutoff | Jan 2026 | Nov 2025 |
| Released | Jun 2026 | Mar 2026 |
| Example monthly cost* | $175.00 | $38.00 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, Claude Fable 5 or Gemini 3.1 Pro?
- Claude Fable 5 wins 1 of the 1 benchmarks these models share, against 0 for Gemini 3.1 Pro. On price the gap is dramatic: Gemini 3.1 Pro works out roughly 4.4x cheaper per blended million tokens. Gemini 3.1 Pro also takes 2M of context versus 1M for Claude Fable 5.
- Which is cheaper, Claude Fable 5 or Gemini 3.1 Pro?
- Claude Fable 5 costs $10/$50 per million input/output tokens, while Gemini 3.1 Pro costs $2/$12. For a typical workload of 10M input and 1.5M output tokens per month, that's $175.00 versus $38.00.
- Which model is better for coding, Claude Fable 5 or Gemini 3.1 Pro?
- On SWE-bench Verified — the standard agentic-coding benchmark — Claude Fable 5 scores ~95% versus ~78% for Gemini 3.1 Pro, making Claude Fable 5 the stronger pick for coding agents.
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