Claude Opus 4.5 vs Mistral Small 4 Comparison

Comparing Claude Opus 4.5 and Mistral Small 4 across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Opus 4.5 outperforms in 1 benchmarks (GPQA), while Mistral Small 4 is better at 0 benchmarks.

Claude Opus 4.5 significantly outperforms across most benchmarks.

Wed Mar 18 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Mistral Small 4 costs less

For input processing, Claude Opus 4.5 ($5.00/1M tokens) is 33.3x more expensive than Mistral Small 4 ($0.15/1M tokens).

For output processing, Claude Opus 4.5 ($25.00/1M tokens) is 41.7x more expensive than Mistral Small 4 ($0.60/1M tokens).

In conclusion, Claude Opus 4.5 is more expensive than Mistral Small 4.*

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

Lowest available price from all providers

Wed Mar 18 2026 • llm-stats.com

Claude Opus 4.5

Input tokens$5.00

Output tokens$25.00

Best providerAnthropic

Mistral Small 4

Input tokens$0.15

Output tokens$0.60

Best providerMistral

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Context Window

Maximum input and output token capacity

Mistral Small 4 accepts 256,000 input tokens compared to Claude Opus 4.5's 200,000 tokens. Mistral Small 4 can generate longer responses up to 256,000 tokens, while Claude Opus 4.5 is limited to 64,000 tokens.

Claude Opus 4.5

Input200,000 tokens

Output64,000 tokens

Mistral Small 4

Input256,000 tokens

Output256,000 tokens

Wed Mar 18 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.5 and Mistral Small 4 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Opus 4.5

Text

Images

Audio

Video

Mistral Small 4

Text

Images

Audio

Video

License

Usage and distribution terms

Claude Opus 4.5 is licensed under a proprietary license, while Mistral Small 4 uses Apache 2.0.

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

Claude Opus 4.5

Proprietary

Closed source

Mistral Small 4

Apache 2.0

Open weights

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while Mistral Small 4 was released on 2026-03-16.

Mistral Small 4 is 4 months newer than Claude Opus 4.5.

Claude Opus 4.5

Nov 24, 2025

3 months ago

Mistral Small 4

Mar 16, 2026

2 days ago

3mo newer

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while Mistral Small 4's cutoff date is not specified.

We can confirm Claude Opus 4.5's training data extends to 2025-03-31, but cannot make a direct comparison without Mistral Small 4's cutoff date.

Claude Opus 4.5

Mar 2025

Mistral Small 4

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Provider Availability

Claude Opus 4.5 is available from Anthropic. Mistral Small 4 is available from Mistral AI. The availability of providers can affect quality of the model and reliability.