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Comparison · 2 models · Updated Nov 2, 2026

GPT OSS 20B vs DeepSeek-V3

GPT OSS 20B comes out ahead, 61 to 49 on our weighted score, and it is the cheaper option too.

  1. Our pick

    OpenAI

    GPT OSS 20B

    Released Aug 5, 2025

    61/100
    • ECI137.8
    • Price$0.07 / $0.25
    • Context131K
    Full specs Remove GPT OSS 20B

  2. DeepSeek

    DeepSeek-V3

    Released Dec 26, 2024

    49/100
    • ECI132.3
    • Price$0.32 / $1.10
    • Context131K
    Full specs Remove DeepSeek-V3

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

GPT OSS 20B is our pick

GPT OSS 20B is the better all-round choice, scoring 61/100 against DeepSeek-V3 (49). It leads on capability, price and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGPT OSS 20BCapabilities Index (ECI): GPT OSS 20B 137.8 · DeepSeek-V3 132.3
  • Lowest priceGPT OSS 20BGPT OSS 20B $0.115 · DeepSeek-V3 $0.515 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameGPT OSS 20B 131,072 · DeepSeek-V3 131,072 tokens
  • Widest inputsSame inputsGPT OSS 20B: Text · DeepSeek-V3: Text
  • Self-hostingAll open weightsEvery model here can be downloaded and run on your own hardware
How the score is built
MeasureWeightGPT OSS 20BDeepSeek-V3
CapabilityCapabilities Index (ECI)50%6155
Price25%9061
Inputs & features15%3525
Context window10%2525
Overall100%61/10049/100
02 — Side by side

Every spec in one table

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

GPT OSS 20B vs DeepSeek-V3 specifications side by side
SpecificationGPT OSS 20BOpenAIDeepSeek-V3DeepSeek
Capability
Capabilities Index (ECI)137.8 (best)132.3
ECI rank#122 of 165 (best)#136 of 165
GPQA DiamondGraduate-level science questions60.8% (best)56.5%
OTIS Mock AIME 2024–2025Competition mathematics65.3% (best)15.8%
Price per million tokens
Input$0.07 (best)$0.32
Output$0.25 (best)$1.10
Cached input——
Blended (3:1)$0.115 (best)$0.515
Long-context rateSame rateSame rate
Price sourceMedian of 37 providersMedian of 8 providers
Limits
Context window131,072 tokens131,072 tokens
Max output32,768 tokens (best)8,192 tokens
Inputs and features
TextYesYes
ImagesNoNo
PDFsNoNo
AudioNoNo
VideoNoNo
ReasoningYesNo
Tool callingYesYes
Structured outputNoNo
Availability
WeightsOpenOpenDeepSeek Model License
API model ID——
API providers41 (best)8
ReleasedAug 5, 2025Dec 26, 2024
Knowledge cutoffJun 2024—
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 20B$1.20
  • DeepSeek-V3$5.40
04 — Questions

Which should you choose?

Which is better: GPT OSS 20B or DeepSeek-V3?

GPT OSS 20B is the better all-round choice, scoring 61/100 against DeepSeek-V3 (49). It leads on capability, price and inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, GPT OSS 20B or DeepSeek-V3?

GPT OSS 20B is cheaper at $0.07 input / $0.25 output per million tokens (median across 37 API providers). DeepSeek-V3 costs $0.32 input / $1.10 output per million tokens (median across 8 API providers). At a typical mix of three input tokens to one output token, that is $0.115 per million tokens for GPT OSS 20B versus $0.515 for DeepSeek-V3 (4.5× as much).

Which scores higher on benchmarks?

GPT OSS 20B scores higher on the Capabilities Index (ECI): GPT OSS 20B 137.8 (#122 of 165) and DeepSeek-V3 132.3 (#136 of 165). The confidence ranges of the top two overlap (133.1–139.7 vs 127.5–135.5), so treat the gap as small. On individual benchmarks: GPQA Diamond — GPT OSS 20B 60.8%, DeepSeek-V3 56.5%; OTIS Mock AIME 2024–2025 — GPT OSS 20B 65.3%, DeepSeek-V3 15.8%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT OSS 20B and DeepSeek-V3 yet, so there is no like-for-like coding score. On overall capability, GPT OSS 20B 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?

GPT OSS 20B and DeepSeek-V3 share the same 131,072-token context window. Maximum output per response: GPT OSS 20B up to 32,768, DeepSeek-V3 up to 8,192 tokens.

Which can read images, PDFs, audio or video?

GPT OSS 20B accepts text; DeepSeek-V3 accepts text. They handle the same number of input types.

Are any of these open source?

Yes, both publish their weights (DeepSeek Model License), so you can self-host them.

Which is newer?

GPT OSS 20B is the newest, released Aug 5, 2025. DeepSeek-V3 came out Dec 26, 2024. Knowledge cutoff: GPT OSS 20B Jun 2024.

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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