GPT-5.5 vs Kimi K2.5
GPT-5.5 (OpenAI) and Kimi K2.5 (Moonshot) compared on benchmarks, pricing, context window, and use-case rankings.
- GPT-5.5 leads on overall intelligence (ECI 159 vs 148).
- Kimi K2.5 is cheaper on input tokens — $0.38 vs $5.00 per 1M.
- GPT-5.5 has a larger context window (1.1M vs 262K tokens).
- GPT-5.5 ranks higher for coding (89th vs 46th percentile).
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 GPT-5.5 better than Kimi K2.5?
On Epoch AI's Capabilities Index, GPT-5.5 scores higher (159) than Kimi K2.5 (148). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, GPT-5.5 or Kimi K2.5?
Kimi K2.5 is cheaper on input tokens at $0.38 per million, versus $5.00 (representative OpenRouter pricing).
Which has a larger context window, GPT-5.5 or Kimi K2.5?
GPT-5.5 supports up to 1.1M tokens, compared with 262K for the other.
Which is better for coding, GPT-5.5 or Kimi K2.5?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, GPT-5.5 ranks higher — 89th vs 46th 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.