Model Comparison

Devstral Medium vs GPT OSS 20B

Comparing Devstral Medium and GPT OSS 20B across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Devstral Medium and GPT OSS 20B don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT OSS 20B costs less

For input processing, Devstral Medium ($0.40/1M tokens) is 8.0x more expensive than GPT OSS 20B ($0.05/1M tokens).

For output processing, Devstral Medium ($2.00/1M tokens) is 10.0x more expensive than GPT OSS 20B ($0.20/1M tokens).

In conclusion, Devstral Medium is more expensive than GPT OSS 20B.*

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

Lowest available price from all providers
Fri May 15 2026 • llm-stats.com
Mistral AI
Devstral Medium
Input tokens$0.40
Output tokens$2.00
Best providerMistral
OpenAI
GPT OSS 20B
Input tokens$0.05
Output tokens$0.20
Best providerNovita
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT OSS 20B accepts 131,072 input tokens compared to Devstral Medium's 128,000 tokens. Devstral Medium can generate longer responses up to 128,000 tokens, while GPT OSS 20B is limited to 32,768 tokens.

Mistral AI
Devstral Medium
Input128,000 tokens
Output128,000 tokens
OpenAI
GPT OSS 20B
Input131,072 tokens
Output32,768 tokens
Fri May 15 2026 • llm-stats.com

License

Usage and distribution terms

Devstral Medium is licensed under a proprietary license, while GPT OSS 20B uses Apache 2.0.

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

Devstral Medium

Proprietary

Closed source

GPT OSS 20B

Apache 2.0

Open weights

Release Timeline

When each model was launched

Devstral Medium was released on 2025-07-10, while GPT OSS 20B was released on 2025-08-05.

GPT OSS 20B is 1 month newer than Devstral Medium.

Devstral Medium

Jul 10, 2025

10 months ago

GPT OSS 20B

Aug 5, 2025

9 months ago

3w 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

Devstral Medium is available from Mistral AI. GPT OSS 20B is available from Novita, Fireworks, Groq, OpenAI.

Devstral Medium

mistral logo
Mistral
Input Price:Input: $0.40/1MOutput Price:Output: $2.00/1M

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

Mistral AI

No standout differentiators in the data we have for this pair.

OpenAI
Larger context window (131,072 tokens)
Less expensive input tokens
Less expensive output tokens
Has open weights

Detailed Comparison

AI Model Comparison Table
Feature
Mistral AI
Devstral Medium
OpenAI
GPT OSS 20B

FAQ

Common questions about Devstral Medium vs GPT OSS 20B.

Which is better, Devstral Medium or GPT OSS 20B?

Devstral Medium (Mistral AI) and GPT OSS 20B (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Devstral Medium compare to GPT OSS 20B in benchmarks?

Devstral Medium scores SWE-Bench Verified: 61.6%. GPT OSS 20B scores MMLU: 85.3%, CodeForces: 74.3%, GPQA: 71.5%, TAU-bench Retail: 54.8%, HealthBench: 42.5%.

Is Devstral Medium cheaper than GPT OSS 20B?

GPT OSS 20B is 8.0x cheaper for input tokens. Devstral Medium costs $0.40/M input and $2.00/M output via mistral. GPT OSS 20B costs $0.05/M input and $0.20/M output via novita.

What are the context window sizes for Devstral Medium and GPT OSS 20B?

Devstral Medium supports 128K 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 Devstral Medium and GPT OSS 20B?

Key differences include context window (128K vs 131K), input pricing ($0.40 vs $0.05/M), licensing (Proprietary vs Apache 2.0). See the full comparison above for benchmark-by-benchmark results.

Who makes Devstral Medium and GPT OSS 20B?

Devstral Medium is developed by Mistral AI and GPT OSS 20B is developed by OpenAI.