Model Comparison
o1 vs Devstral MediumWhich is better in 2026?
Devstral Medium significantly outperforms across most benchmarks. Devstral Medium is 32.8x cheaper per token.
Verdict: o1 vs Devstral Medium — which is better?
o1 (by OpenAI) and Devstral Medium (by Mistral AI) 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.
o1 outperforms in 0 benchmarks, while Devstral Medium is better at 1 benchmark (SWE-Bench Verified). Devstral Medium significantly outperforms across most benchmarks.
On price, Devstral Medium is roughly 32.8x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
o1 also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose o1 if…
- you process long inputs — it offers a 200,000 token context window
Choose Devstral Medium if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- cost matters — it's about 32.8x cheaper per token
- you want the most recent training data — it shipped Jul 2025
Performance Benchmarks
Comparative analysis across standard metrics
o1 outperforms in 0 benchmarks, while Devstral Medium is better at 1 benchmark (SWE-Bench Verified).
Devstral Medium significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, o1 ($15.00/1M tokens) is 37.5x more expensive than Devstral Medium ($0.40/1M tokens).
For output processing, o1 ($60.00/1M tokens) is 30.0x more expensive than Devstral Medium ($2.00/1M tokens).
In conclusion, o1 is more expensive than Devstral Medium.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
o1 accepts 200,000 input tokens compared to Devstral Medium's 128,000 tokens. Devstral Medium can generate longer responses up to 128,000 tokens, while o1 is limited to 100,000 tokens.
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
o1 was released on 2024-12-17, while Devstral Medium was released on 2025-07-10.
Devstral Medium is 7 months newer than o1.
Dec 17, 2024
1.5 years ago
Jul 10, 2025
11 months ago
6mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
o1 is available from Azure, OpenAI. Devstral Medium is available from Mistral AI.
o1
Devstral Medium
Outputs Comparison
Key Takeaways
o1
View detailsOpenAI
Devstral Medium
View detailsMistral AI
Detailed Comparison
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FAQ
Common questions about o1 vs Devstral Medium.