Model Comparison

DeepSeek-V3.1 vs GPT OSS 20BWhich is better in 2026?

DeepSeek-V3.1 shows notably better performance in the majority of benchmarks. GPT OSS 20B is 5.2x cheaper per token.

Verdict: DeepSeek-V3.1 vs GPT OSS 20B — which is better?

DeepSeek-V3.1 (by DeepSeek) and GPT OSS 20B (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

DeepSeek-V3.1 outperforms in 2 benchmarks (GPQA, Humanity's Last Exam), while GPT OSS 20B is better at 1 benchmark (CodeForces). DeepSeek-V3.1 shows notably better performance in the majority of benchmarks.

On price, GPT OSS 20B is roughly 5.2x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

DeepSeek-V3.1 also accepts a larger context window (163,840 input tokens), making it the stronger choice for long documents and large codebases.

Choose DeepSeek-V3.1 if…

  • you want the strongest raw capability — it leads on 2 of 3 shared benchmarks
  • you process long inputs — it offers a 163,840 token context window

Choose GPT OSS 20B if…

  • cost matters — it's about 5.2x cheaper per token
  • you want the most recent training data — it shipped Aug 2025

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

DeepSeek-V3.1 outperforms in 2 benchmarks (GPQA, Humanity's Last Exam), while GPT OSS 20B is better at 1 benchmark (CodeForces).

DeepSeek-V3.1 shows notably better performance in the majority of benchmarks.

Mon Jul 27 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 20B costs less

For input processing, DeepSeek-V3.1 ($0.27/1M tokens) is 5.4x more expensive than GPT OSS 20B ($0.05/1M tokens).

For output processing, DeepSeek-V3.1 ($1.00/1M tokens) is 5.0x more expensive than GPT OSS 20B ($0.20/1M tokens).

In conclusion, DeepSeek-V3.1 is more expensive than GPT OSS 20B.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Mon Jul 27 2026 • llm-stats.com
DeepSeek
DeepSeek-V3.1
Input tokens$0.27
Output tokens$1.00
Best providerDeepinfra
OpenAI
GPT OSS 20B
Input tokens$0.05
Output tokens$0.20
Best providerNovita
Notice missing or incorrect data?Start an Issue→

Model Size

Parameter count comparison

650.1B diff

DeepSeek-V3.1 has 650.1B more parameters than GPT OSS 20B, making it 3110.5% larger.

DeepSeek
DeepSeek-V3.1
671.0Bparameters
OpenAI
GPT OSS 20B
20.9Bparameters
671.0B
DeepSeek-V3.1
20.9B
GPT OSS 20B

Context Window

Maximum input and output token capacity

DeepSeek-V3.1 accepts 163,840 input tokens compared to GPT OSS 20B's 131,072 tokens. DeepSeek-V3.1 can generate longer responses up to 163,840 tokens, while GPT OSS 20B is limited to 32,768 tokens.

DeepSeek
DeepSeek-V3.1
Input163,840 tokens
Output163,840 tokens
OpenAI
GPT OSS 20B
Input131,072 tokens
Output32,768 tokens
Mon Jul 27 2026 • llm-stats.com

License

Usage and distribution terms

DeepSeek-V3.1 is licensed under MIT, while GPT OSS 20B uses Apache 2.0.

License differences may affect how you can use these models in commercial or open-source projects.

DeepSeek-V3.1

MIT

Open weights

GPT OSS 20B

Apache 2.0

Open weights

Release Timeline

When each model was launched

DeepSeek-V3.1 was released on 2025-01-10, while GPT OSS 20B was released on 2025-08-05.

GPT OSS 20B is 7 months newer than DeepSeek-V3.1.

DeepSeek-V3.1

Jan 10, 2025

1.5 years ago

GPT OSS 20B

Aug 5, 2025

11 months ago

6mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

DeepSeek-V3.1 is available from DeepInfra, Novita. GPT OSS 20B is available from Novita, Fireworks, Groq, OpenAI.

DeepSeek-V3.1

deepinfra logo
Deepinfra
Input Price:Input: $0.27/1MOutput Price:Output: $1.00/1M
novita logo
Novita
Input Price:Input: $0.27/1MOutput Price:Output: $1.00/1M

GPT OSS 20B

novita logo
Novita
Input Price:Input: $0.05/1MOutput Price:Output: $0.20/1M
fireworks logo
Fireworks
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
groq logo
Groq
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
openai logo
OpenAI
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

DeepSeek
Larger context window (163,840 tokens)
Higher GPQA score (74.9% vs 71.5%)
Higher Humanity's Last Exam score (15.9% vs 10.9%)
OpenAI
Less expensive input tokens
Less expensive output tokens
Higher CodeForces score (74.3% vs 69.7%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against DeepSeek-V3.1 and GPT OSS 20B side-by-side, then vote on the output you prefer.

DeepSeek-V3.1
✓ Preferred
GPT OSS 20B
Open in Playground
AI Model Comparison Table
Feature
DeepSeek
DeepSeek-V3.1
OpenAI
GPT OSS 20B

FAQ

Common questions about DeepSeek-V3.1 vs GPT OSS 20B.

Which is better, DeepSeek-V3.1 or GPT OSS 20B?

DeepSeek-V3.1 shows notably better performance in the majority of benchmarks. DeepSeek-V3.1 is made by DeepSeek and GPT OSS 20B is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does DeepSeek-V3.1 compare to GPT OSS 20B in benchmarks?

DeepSeek-V3.1 scores SimpleQA: 93.4%, MMLU-Redux: 91.8%, MMLU-Pro: 83.7%, GPQA: 74.9%, CodeForces: 69.7%. GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%.

Is DeepSeek-V3.1 cheaper than GPT OSS 20B?

GPT OSS 20B is 5.4x cheaper for input tokens. DeepSeek-V3.1 costs $0.27/M input and $1.00/M output via deepinfra. GPT OSS 20B costs $0.05/M input and $0.20/M output via novita.

What are the context window sizes for DeepSeek-V3.1 and GPT OSS 20B?

DeepSeek-V3.1 supports 164K tokens and GPT OSS 20B supports 131K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between DeepSeek-V3.1 and GPT OSS 20B?

Key differences include context window (164K vs 131K), input pricing ($0.27 vs $0.05/M), licensing (MIT vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes DeepSeek-V3.1 and GPT OSS 20B?

DeepSeek-V3.1 is developed by DeepSeek and GPT OSS 20B is developed by OpenAI.

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