Claude Mythos 5.1 vs Devstral Medium
Claude Mythos 5.1 leads the LLM Stats Score 45.1 to 13.6. Devstral Medium is 25.0x cheaper per token.
Anthropic · Mistral AI · Updated for 2026
Which is better?
Claude Mythos 5.1 leads the overall LLM Stats Score 45.1 to 13.6, ranking #33 overall.
On price, Devstral Medium is roughly 25.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Claude Mythos 5.1 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Claude Mythos 5.1
- overall performance matters — it scores 45.1 and ranks #33 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Sep 2026
Choose Devstral Medium
- cost matters — it's about 25.0x cheaper per token
At a glance
The differences that matter most.
Individual benchmarks
1 reported for Claude Mythos 5.1 · 1 for Devstral Medium
Claude Mythos 5.1 and Devstral Mediumdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Claude Mythos 5.1 ($10.00/1M tokens) is 25.0x more expensive than Devstral Medium ($0.40/1M tokens).
For output processing, Claude Mythos 5.1 ($50.00/1M tokens) is 25.0x more expensive than Devstral Medium ($2.00/1M tokens).
In conclusion, Claude Mythos 5.1 is more expensive than Devstral Medium.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Claude Mythos 5.1 accepts 1,000,000 input tokens compared to Devstral Medium's 128,000 tokens. Both models can generate responses up to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Claude Mythos 5.1 supports multimodal inputs, whereas Devstral Medium does not.
Claude Mythos 5.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Mythos 5.1
Devstral Medium
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
Claude Mythos 5.1 was released on 2026-09-01, while Devstral Medium was released on 2025-07-10.
Claude Mythos 5.1 is 14 months newer than Devstral Medium.
Sep 1, 2026
2 weeks ago
1.1yr newerJul 10, 2025
1.2 years ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Claude Mythos 5.1 is available from Anthropic. Devstral Medium is available from Mistral AI.
Claude Mythos 5.1
Devstral Medium
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Mythos 5.1 and Devstral Medium side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Mythos 5.1 vs Devstral Medium.