Model Comparison

Devstral Small 1.1 vs o1-previewWhich is better in 2026?

Devstral Small 1.1 significantly outperforms across most benchmarks. Devstral Small 1.1 is 175.0x cheaper per token.

Verdict: Devstral Small 1.1 vs o1-preview — which is better?

Devstral Small 1.1 (by Mistral AI) and o1-preview (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 Small 1.1 outperforms in 1 benchmarks (SWE-Bench Verified), while o1-preview is better at 0 benchmarks. Devstral Small 1.1 significantly outperforms across most benchmarks.

On price, Devstral Small 1.1 is roughly 175.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Choose Devstral Small 1.1 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • cost matters — it's about 175.0x cheaper per token
  • you want the most recent training data — it shipped Jul 2025
  • you need open weights you can self-host or fine-tune

Choose o1-preview if…

  • you want predictable pricing at $15.00/M input and $60.00/M output

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Devstral Small 1.1 outperforms in 1 benchmarks (SWE-Bench Verified), while o1-preview is better at 0 benchmarks.

Devstral Small 1.1 significantly outperforms across most benchmarks.

Sat Jun 27 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Devstral Small 1.1 costs less

For input processing, Devstral Small 1.1 ($0.10/1M tokens) is 150.0x cheaper than o1-preview ($15.00/1M tokens).

For output processing, Devstral Small 1.1 ($0.30/1M tokens) is 200.0x cheaper than o1-preview ($60.00/1M tokens).

In conclusion, o1-preview is more expensive than Devstral Small 1.1.*

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

Lowest available price from all providers
Sat Jun 27 2026 • llm-stats.com
Mistral AI
Devstral Small 1.1
Input tokens$0.10
Output tokens$0.30
Best providerMistral
OpenAI
o1-preview
Input tokens$15.00
Output tokens$60.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Both models have the same input context window of 128,000 tokens. Devstral Small 1.1 can generate longer responses up to 128,000 tokens, while o1-preview is limited to 32,768 tokens.

Mistral AI
Devstral Small 1.1
Input128,000 tokens
Output128,000 tokens
OpenAI
o1-preview
Input128,000 tokens
Output32,768 tokens
Sat Jun 27 2026 • llm-stats.com

License

Usage and distribution terms

Devstral Small 1.1 is licensed under Apache 2.0, while o1-preview uses a proprietary license.

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

Devstral Small 1.1

Apache 2.0

Open weights

o1-preview

Proprietary

Closed source

Release Timeline

When each model was launched

Devstral Small 1.1 was released on 2025-07-11, while o1-preview was released on 2024-09-12.

Devstral Small 1.1 is 10 months newer than o1-preview.

Devstral Small 1.1

Jul 11, 2025

11 months ago

10mo newer
o1-preview

Sep 12, 2024

1.8 years ago

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 Small 1.1 is available from Mistral AI. o1-preview is available from OpenAI, Azure.

Devstral Small 1.1

mistral logo
Mistral
Input Price:Input: $0.10/1MOutput Price:Output: $0.30/1M

o1-preview

openai logo
OpenAI
Input Price:Input: $15.00/1MOutput Price:Output: $60.00/1M
azure logo
Azure
Input Price:Input: $16.50/1MOutput Price:Output: $66.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Mistral AI
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher SWE-Bench Verified score (53.6% vs 41.3%)
OpenAI

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

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Devstral Small 1.1 and o1-preview side-by-side, then vote on the output you prefer.

Devstral Small 1.1
✓ Preferred
o1-preview
Open in Playground
AI Model Comparison Table
Feature
Mistral AI
Devstral Small 1.1
OpenAI
o1-preview

FAQ

Common questions about Devstral Small 1.1 vs o1-preview.

Which is better, Devstral Small 1.1 or o1-preview?

Devstral Small 1.1 significantly outperforms across most benchmarks. Devstral Small 1.1 is made by Mistral AI and o1-preview is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Devstral Small 1.1 compare to o1-preview in benchmarks?

Devstral Small 1.1 scores SWE-Bench Verified: 53.6%. o1-preview scores MGSM: 90.8%, MMLU: 90.8%, MATH: 85.5%, GPQA: 73.3%, LiveBench: 52.3%.

Is Devstral Small 1.1 cheaper than o1-preview?

Devstral Small 1.1 is 150.0x cheaper for input tokens. Devstral Small 1.1 costs $0.10/M input and $0.30/M output via mistral. o1-preview costs $15.00/M input and $60.00/M output via openai.

What are the context window sizes for Devstral Small 1.1 and o1-preview?

Devstral Small 1.1 supports 128K tokens and o1-preview supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Devstral Small 1.1 and o1-preview?

Key differences include input pricing ($0.10 vs $15.00/M), licensing (Apache 2.0 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Devstral Small 1.1 and o1-preview?

Devstral Small 1.1 is developed by Mistral AI and o1-preview is developed by OpenAI.

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