Model Comparison

Devstral Small 1.1 vs GPT-4.5Which is better in 2026?

Devstral Small 1.1 significantly outperforms across most benchmarks. Devstral Small 1.1 is 625.0x cheaper per token.

Verdict: Devstral Small 1.1 vs GPT-4.5 — which is better?

Devstral Small 1.1 (by Mistral AI) and GPT-4.5 (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 GPT-4.5 is better at 0 benchmarks. Devstral Small 1.1 significantly outperforms across most benchmarks.

On price, Devstral Small 1.1 is roughly 625.0x 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 625.0x 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 GPT-4.5 if…

  • you want predictable pricing at $75.00/M input and $150.00/M output
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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Devstral Small 1.1 outperforms in 1 benchmarks (SWE-Bench Verified), while GPT-4.5 is better at 0 benchmarks.

Devstral Small 1.1 significantly outperforms across most benchmarks.

Fri Jun 12 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 750.0x cheaper than GPT-4.5 ($75.00/1M tokens).

For output processing, Devstral Small 1.1 ($0.30/1M tokens) is 500.0x cheaper than GPT-4.5 ($150.00/1M tokens).

In conclusion, GPT-4.5 is more expensive than Devstral Small 1.1.*

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

Lowest available price from all providers
Fri Jun 12 2026 • llm-stats.com
Mistral AI
Devstral Small 1.1
Input tokens$0.10
Output tokens$0.30
Best providerMistral
OpenAI
GPT-4.5
Input tokens$75.00
Output tokens$150.00
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 GPT-4.5 is limited to 4,096 tokens.

Mistral AI
Devstral Small 1.1
Input128,000 tokens
Output128,000 tokens
OpenAI
GPT-4.5
Input128,000 tokens
Output4,096 tokens
Fri Jun 12 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-4.5 supports multimodal inputs, whereas Devstral Small 1.1 does not.

GPT-4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Devstral Small 1.1

Text
Images
Audio
Video

GPT-4.5

Text
Images
Audio
Video

License

Usage and distribution terms

Devstral Small 1.1 is licensed under Apache 2.0, while GPT-4.5 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

GPT-4.5

Proprietary

Closed source

Release Timeline

When each model was launched

Devstral Small 1.1 was released on 2025-07-11, while GPT-4.5 was released on 2025-02-27.

Devstral Small 1.1 is 4 months newer than GPT-4.5.

Devstral Small 1.1

Jul 11, 2025

11 months ago

4mo newer
GPT-4.5

Feb 27, 2025

1.3 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. GPT-4.5 is available from OpenAI.

Devstral Small 1.1

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

GPT-4.5

openai logo
OpenAI
Input Price:Input: $75.00/1MOutput Price:Output: $150.00/1M
* 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 38.0%)
OpenAI
Supports multimodal inputs

Detailed Comparison

AI Model Comparison Table
Feature
Mistral AI
Devstral Small 1.1
OpenAI
GPT-4.5

FAQ

Common questions about Devstral Small 1.1 vs GPT-4.5.

Which is better, Devstral Small 1.1 or GPT-4.5?

Devstral Small 1.1 significantly outperforms across most benchmarks. Devstral Small 1.1 is made by Mistral AI and GPT-4.5 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 GPT-4.5 in benchmarks?

Devstral Small 1.1 scores SWE-Bench Verified: 53.6%. GPT-4.5 scores GSM8k: 97.0%, MMLU: 90.8%, CharXiv-D: 90.0%, IFEval: 88.2%, HumanEval: 88.0%.

Is Devstral Small 1.1 cheaper than GPT-4.5?

Devstral Small 1.1 is 750.0x cheaper for input tokens. Devstral Small 1.1 costs $0.10/M input and $0.30/M output via mistral. GPT-4.5 costs $75.00/M input and $150.00/M output via openai.

What are the context window sizes for Devstral Small 1.1 and GPT-4.5?

Devstral Small 1.1 supports 128K tokens and GPT-4.5 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 GPT-4.5?

Key differences include input pricing ($0.10 vs $75.00/M), multimodal support (no vs yes), licensing (Apache 2.0 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Devstral Small 1.1 and GPT-4.5?

Devstral Small 1.1 is developed by Mistral AI and GPT-4.5 is developed by OpenAI.

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