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Gemini 3.5 Flash vs GLM 5.1

Head to head on 25 shared benchmarks, with price, context window, and release dates.

Benchmark scores

39

evals · sort by any column, ⤢ to expand fullscreen

Model
Gemini 3.5 Flash

Google (Alphabet Inc.)

64.7%26.0%71.857.9%39.0%92.2%42.7%76.3%78.9%78.2%64.9%75.6%84.6%88.2%82.0%76.3%55.8%76.6%31.0%53.1%74.4%40.9%53.1%48.7%95.3%---1087elo----68.1%49.9%---62.9%64.3%
GLM 5.1

Zai

64.5%40.0%73.544.8%33.5%86.8%30.1%76.3%72.7%75.4%63.2%68.5%71.8%84.9%72.5%67.0%41.6%72.3%22.2%43.8%71.2%43.2%52.5%31.5%97.7%20.8%35.9%1.13-1589elo34.7%15.1%85.4%--34.6%5.2469.8-55.1%
2 / 2 models
AttributeGemini 3.5 Flash

Google (Alphabet Inc.)

GLM 5.1

Zai

DescriptionGemini 3.5 Flash is an AI model from Google (Alphabet Inc.).GLM-5.1 is an AI model from Zai, released with open weights.
FamilyGeminiGlm
Params--
Open weightsclosedopen
Licenseproprietarymit
Released19 May 20267 Apr 2026
Context1,048,576204,800
Input $/1M$1.50$1.28
Output $/1M$9.00$4.07
Cache read $/1M$0.150$0.179
Cache write $/1M$0.083-
Speed0 tok/s0 tok/s
Latency0.00 s0.00 s
Modalitiestext, image, video, file, audiotext
Providers--
PublisherGoogle (Alphabet Inc.)Zai
Reported scores

FAQ

Is Gemini 3.5 Flash or GLM 5.1 better?
Across the 25 benchmarks both models report on Sophon, Gemini 3.5 Flash leads on 21 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
How do Gemini 3.5 Flash and GLM 5.1 compare on GPQA Diamond?
Gemini 3.5 Flash scores 92.2% and GLM 5.1 scores 86.8% on GPQA Diamond.
Which is cheaper, Gemini 3.5 Flash or GLM 5.1?
GLM 5.1 is cheaper at $4.07 per million output tokens against $9.00 for Gemini 3.5 Flash - about 2.2x.
When were Gemini 3.5 Flash and GLM 5.1 released?
Gemini 3.5 Flash was released 19 May 2026 by Google (Alphabet Inc.). GLM 5.1 was released 7 Apr 2026 by Zai.

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