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GPT-5 Nano vs Kimi K2.5

Head to head on 22 shared benchmarks, with price, context window, and release dates.

Benchmark scores

64

evals · sort by any column, ⤢ to expand fullscreen

Model
Kimi K2.5

Moonshot AI

1576elo74.927.9%78.9%13.2%43.7%72.5%77.9%61.4%57.4%77.7%84.9%76.0%39.3%76.4%66.5%49.9%39.6%70.8%74.2%18.9%81.3%--96.1---68.3%39.0%-35.8%---95.478.5%10421-----62.0%-87.1---63.3%---7367.3%69.4-26.3%--17.5%---56.8%
GPT-5 Nano

OpenAI

703elo288.3%42.8%4.0%32.5%52.8%62.4%43.4%55.7%46.8%68.4%40.3%30.4%72.9%53.6%30.4%29.1%34.8%67.4%6.8%25.7%0.0%27.3%-0.250.216.7%--10.0%-78.2%1.18100.0%---47.0%1.381.38100.0%100.0%-26.7%-55.6%100.0%0.0%-0.0%12.0%1.72---29.7%-20.41-6.67-82.0%82.0%40.0%43.7%
2 / 2 models
AttributeGPT-5 Nano

OpenAI

Kimi K2.5

Moonshot AI

DescriptionGPT-5 nano is an AI model from OpenAI.Kimi K2.5 is an AI model from Kimi.
FamilyGPTKimi
Params--
Open weightsclosedclosed
LicenseproprietaryModified MIT
Released7 Aug 202527 Jan 2026
Context400,000262,144
Input $/1M$0.05$0.60
Output $/1M$0.40$3.00
Cache read $/1M$0.005$0.100
Cache write $/1M--
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestext, image, filetext, image
Providers--
PublisherOpenAIMoonshot AI
Reported scores

FAQ

Is GPT-5 Nano or Kimi K2.5 better?
Across the 22 benchmarks both models report on Sophon, Kimi K2.5 leads on 22 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do GPT-5 Nano and Kimi K2.5 compare on GPQA Diamond?
GPT-5 Nano scores 42.8% and Kimi K2.5 scores 78.9% on GPQA Diamond.
Which is cheaper, GPT-5 Nano or Kimi K2.5?
GPT-5 Nano is cheaper at $0.40 per million output tokens against $3.00 for Kimi K2.5 - about 7.5x.
When were GPT-5 Nano and Kimi K2.5 released?
GPT-5 Nano was released 7 Aug 2025 by OpenAI. Kimi K2.5 was released 27 Jan 2026 by Moonshot AI.

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