Claude Fable 5.1 vs Kimi K3
Claude Fable 5.1 (Anthropic) and Kimi K3 (Moonshot) compared on benchmarks, pricing, context window, and use-case rankings.
- Claude Fable 5.1 leads on overall intelligence (ECI 163 vs 158).
- Kimi K3 is cheaper on input tokens — $2.55 vs $10.00 per 1M.
- Kimi K3 has a larger context window (1M vs 1M tokens).
- Claude Fable 5.1 ranks higher for coding (100th vs 97th percentile).
| Attribute | Claude Fable 5.1 | Kimi K3 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 163 | 158 |
| Coding | 100 | 97 |
| Math | 96 | 81 |
| Reasoning & Knowledge | 94 | 73 |
| Agentic & Tools | 98 | 80 |
| Specifications | ||
| Developer | Anthropic | Moonshot |
| Family | Claude | Kimi |
| Released | Sep 1, 2026 | Jul 16, 2026 |
| Parameters | — | 2.8T |
| Availability | API access | Open weights (non-commercial) |
| Context window | 1M | 1M |
| Price — $/M input | $10.00 | $2.55 |
| Price — $/M output | $50.00 | $12.75 |
| Inputs | text, image, file | text, image, video |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 97% |
| APEX | 47% | 39% |
| ARC-AGI | 98% | 95% |
| ARC-AGI-2 | 90% | 60% |
| GPQA Diamond | 94% | 93% |
| Humanity's Last Exam | 47% | 47% |
| SciCode | 63% | 60% |
| SimpleQA Verified | 71% | 51% |
| WebDev Arena | 1765 | 1674 |
| WeirdML | 93% | 83% |
| SimpleBench | — | 61% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is Claude Fable 5.1 better than Kimi K3?
On Epoch AI's Capabilities Index, Claude Fable 5.1 scores higher (163) than Kimi K3 (158). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, Claude Fable 5.1 or Kimi K3?
Kimi K3 is cheaper on input tokens at $2.55 per million, versus $10.00 (representative OpenRouter pricing).
Which has a larger context window, Claude Fable 5.1 or Kimi K3?
Kimi K3 supports up to 1M tokens, compared with 1M for the other.
Which is better for coding, Claude Fable 5.1 or Kimi K3?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Claude Fable 5.1 ranks higher — 100th vs 97th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.