Model Comparison
Devstral Medium vs o3Which is better in 2026?
o3 significantly outperforms across most benchmarks. Devstral Medium is 4.4x cheaper per token.
Verdict: Devstral Medium vs o3 — which is better?
Devstral Medium (by Mistral AI) and o3 (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.
Devstral Medium outperforms in 0 benchmarks, while o3 is better at 1 benchmark (SWE-Bench Verified). o3 significantly outperforms across most benchmarks.
On price, Devstral Medium is roughly 4.4x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
o3 also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Devstral Medium if…
- cost matters — it's about 4.4x cheaper per token
- you want the most recent training data — it shipped Jul 2025
Choose o3 if…
- you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
- you process long inputs — it offers a 200,000 token context window
Performance Benchmarks
Comparative analysis across standard metrics
Devstral Medium outperforms in 0 benchmarks, while o3 is better at 1 benchmark (SWE-Bench Verified).
o3 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Devstral Medium ($0.40/1M tokens) is 5.0x cheaper than o3 ($2.00/1M tokens).
For output processing, Devstral Medium ($2.00/1M tokens) is 4.0x cheaper than o3 ($8.00/1M tokens).
In conclusion, o3 is more expensive than Devstral Medium.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
o3 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 o3 is limited to 100,000 tokens.
Input Capabilities
Supported data types and modalities
o3 supports multimodal inputs, whereas Devstral Medium does not.
o3 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Devstral Medium
o3
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
Devstral Medium was released on 2025-07-10, while o3 was released on 2025-04-16.
Devstral Medium is 3 months newer than o3.
Jul 10, 2025
1.0 years ago
2mo newerApr 16, 2025
1.2 years ago
Knowledge Cutoff
When training data ends
o3 has a documented knowledge cutoff of 2024-05-31, while Devstral Medium's cutoff date is not specified.
We can confirm o3's training data extends to 2024-05-31, but cannot make a direct comparison without Devstral Medium's cutoff date.
—
May 2024
Provider Availability
Devstral Medium is available from Mistral AI. o3 is available from OpenAI.
Devstral Medium
o3
Outputs Comparison
Key Takeaways
Devstral Medium
View detailsMistral AI
o3
View detailsOpenAI
Devstral Mediumo3Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Devstral Medium and o3 side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Devstral Medium vs o3.