Claude Fable 5.1 vs Gemini 3.7 Flash: Specs & Benchmark Comparison
Claude Fable 5.1 is developed by Anthropic, while Gemini 3.7 Flash comes from Google. Gemini 3.7 Flash was released in August 2026, and Claude Fable 5.1 followed a month later in September 2026.
The two models share 3 published benchmarks. Claude Fable 5.1 leads on 3 of them. The widest gaps are on OSWorld 2.0, where Claude Fable 5.1 scores 77.9% against 47.9%; GDPval-AA, where Claude Fable 5.1 scores 61.8% against 50.8%. Averaged across everything we track, Claude Fable 5.1 sits at 59.7% and Gemini 3.7 Flash at 59.8%.
Gemini 3.7 Flash is the cheaper API at $0.75 per million input tokens and $3.75 per million output tokens, roughly 13 times cheaper than Claude Fable 5.1 at $10 and $50. Both accept a context window of about 1M tokens. Both accept text and images as input.
| Characteristic | Claude Fable 5.1 | Gemini 3.7 Flash |
|---|---|---|
| Company | Anthropic | |
| Release Date | September 1, 2026 | August 13, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.0M |
| Context (output) | 128K | 66K |
| Input Price / 1M | $10.00 | $0.75 |
| Output Price / 1M | $50.00 | $3.75 |
| Average Score | 59.7% | 59.8% |
| Benchmarks | ||
| OSWorld 2.0 | 77.9% | 47.9% |
| GDPval-AA | 61.8% | 50.8% |
| AutomationBench | 31.4% | 30.4% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: Claude Fable 5.1 — 0.6, Gemini 3.7 Flash — 0.6.
Gemini 3.7 Flash is 13.3x cheaper: input $0.75/1M vs $10.00/1M tokens.
Same context size: 1M tokens.
Claude Fable 5.1 is newer: released 9/1/2026 vs 8/13/2026.
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Frequently Asked Questions
Which is better for coding — Claude Fable 5.1 or Gemini 3.7 Flash?
Which model is cheaper — Claude Fable 5.1 or Gemini 3.7 Flash?
Which has a larger context window — Claude Fable 5.1 or Gemini 3.7 Flash?
The Claude Fable 5.1 and Gemini 3.7 Flash comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Fable 5.1 or Gemini 3.7 Flash page. See also the complete list of AI model comparisons.