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Comparison · 2 models · Updated Nov 2, 2026

GPT OSS 120B vs Gemma 4 31B IT

Gemma 4 31B IT comes out ahead, 68 to 58 on our weighted score, and it is the cheaper option too.

  1. OpenAI

    GPT OSS 120B

    Released Aug 5, 2025

    58/100
    • ECI139.8
    • Price$0.15 / $0.60
    • Context131K
    Full specs Remove GPT OSS 120B
  2. Our pick

    Google

    Gemma 4 31B IT

    Released Apr 2, 2026

    68/100
    • ECI143.1
    • Price$0.14 / $0.40
    • Context262K
    Full specs Remove Gemma 4 31B IT

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Gemma 4 31B IT is our pick

Gemma 4 31B IT is the better all-round choice, scoring 68/100 against GPT OSS 120B (58). It leads on capability, price, inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGemma 4 31B ITCapabilities Index (ECI): Gemma 4 31B IT 143.1 · GPT OSS 120B 139.8
  • Lowest priceGemma 4 31B ITGemma 4 31B IT $0.205 · GPT OSS 120B $0.263 per 1M tokens (3:1 blend)
  • Longest contextGemma 4 31B ITGemma 4 31B IT 262,144 · GPT OSS 120B 131,072 tokens
  • Widest inputsGemma 4 31B ITGPT OSS 120B: Text · Gemma 4 31B IT: Text, Images
  • Self-hostingAll open weightsEvery model here can be downloaded and run on your own hardware
How the score is built
MeasureWeightGPT OSS 120BGemma 4 31B IT
CapabilityCapabilities Index (ECI)50%6468
Price25%7479
Inputs & features15%3570
Context window10%2537
Overall100%58/10068/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

GPT OSS 120B vs Gemma 4 31B IT specifications side by side
SpecificationGPT OSS 120BOpenAIGemma 4 31B ITGoogle
Capability
Capabilities Index (ECI)139.8143.1 (best)
ECI rank#114 of 165#96 of 165 (best)
GPQA DiamondGraduate-level science questions75.8%75.8%
OTIS Mock AIME 2024–2025Competition mathematics88.9% (best)73.3%
SimpleQA VerifiedShort factual questions—10.4%
Price per million tokens
Input$0.15$0.14 (best)
Output$0.60$0.40 (best)
Cached input——
Blended (3:1)$0.263$0.205 (best)
Long-context rateSame rateSame rate
Price sourceMedian of 65 providersMedian of 36 providers
Limits
Context window131,072 tokens262,144 tokens (best)
Max output32,768 tokens32,768 tokens
Inputs and features
TextYesYes
ImagesNoYes
PDFsNoNo
AudioNoNo
VideoNoNo
ReasoningYesYes
Tool callingYesYes
Structured outputNoYes
Availability
WeightsOpenOpen
API model ID—gemma-4-31b-it
API providers67 (best)46
ReleasedAug 5, 2025Apr 2, 2026
Knowledge cutoffJun 2024Jan 2025
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • GPT OSS 120B$2.70
  • Gemma 4 31B IT$2.20
04 — Questions

Which should you choose?

Which is better: GPT OSS 120B or Gemma 4 31B IT?

Gemma 4 31B IT is the better all-round choice, scoring 68/100 against GPT OSS 120B (58). It leads on capability, price, inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, GPT OSS 120B or Gemma 4 31B IT?

Gemma 4 31B IT is cheaper at $0.14 input / $0.40 output per million tokens (median across 36 API providers). GPT OSS 120B costs $0.15 input / $0.60 output per million tokens (median across 65 API providers). At a typical mix of three input tokens to one output token, that is $0.205 per million tokens for Gemma 4 31B IT versus $0.263 for GPT OSS 120B (1.3× as much).

Which scores higher on benchmarks?

Gemma 4 31B IT scores higher on the Capabilities Index (ECI): Gemma 4 31B IT 143.1 (#96 of 165) and GPT OSS 120B 139.8 (#114 of 165). The confidence ranges of the top two overlap (140.8–145.9 vs 135.6–142.2), so treat the gap as small. On individual benchmarks: GPQA Diamond — GPT OSS 120B 75.8%, Gemma 4 31B IT 75.8%; OTIS Mock AIME 2024–2025 — GPT OSS 120B 88.9%, Gemma 4 31B IT 73.3%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT OSS 120B and Gemma 4 31B IT yet, so there is no like-for-like coding score. On overall capability, Gemma 4 31B IT leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

Gemma 4 31B IT has the largest context window at 262,144 tokens, against 131,072 for GPT OSS 120B. Maximum output per response: GPT OSS 120B up to 32,768, Gemma 4 31B IT up to 32,768 tokens.

Which can read images, PDFs, audio or video?

GPT OSS 120B accepts text; Gemma 4 31B IT accepts text and images. Gemma 4 31B IT handles the widest range of inputs.

Are any of these open source?

Yes, both publish their weights, so you can self-host them.

Which is newer?

Gemma 4 31B IT is the newest, released Apr 2, 2026. GPT OSS 120B came out Aug 5, 2025. Knowledge cutoff: GPT OSS 120B Jun 2024, Gemma 4 31B IT Jan 2025.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.

05 — Keep comparing

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