Claude Mythos 5.1 vs Gemma 4 31B
Claude Mythos 5.1 leads the LLM Stats Score 45.1 to 33.2. Gemma 4 31B is 131.1x cheaper per token.
Anthropic · Google · Updated for 2026
Which is better?
Claude Mythos 5.1 leads the overall LLM Stats Score 45.1 to 33.2, ranking #31 overall.
On price, Gemma 4 31B is roughly 131.1x 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 #31 on LLM Stats
- your work emphasizes reasoning and agents — 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 Gemma 4 31B
- cost matters — it's about 131.1x cheaper per token
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Individual benchmarks
1 reported for Claude Mythos 5.1 · 12 for Gemma 4 31B
Claude Mythos 5.1 and Gemma 4 31Bdon'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 111.1x more expensive than Gemma 4 31B ($0.09/1M tokens).
For output processing, Claude Mythos 5.1 ($50.00/1M tokens) is 147.1x more expensive than Gemma 4 31B ($0.34/1M tokens).
In conclusion, Claude Mythos 5.1 is more expensive than Gemma 4 31B.*
* 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 Gemma 4 31B's 262,144 tokens. Gemma 4 31B can generate longer responses up to 262,144 tokens, while Claude Mythos 5.1 is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Claude Mythos 5.1 and Gemma 4 31B support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Mythos 5.1
Gemma 4 31B
License
Usage and distribution terms
Claude Mythos 5.1 is licensed under a proprietary license, while Gemma 4 31B uses Apache 2.0.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Apache 2.0
Open weights
Release Timeline
When each model was launched
Claude Mythos 5.1 was released on 2026-09-01, while Gemma 4 31B was released on 2026-04-02.
Claude Mythos 5.1 is 5 months newer than Gemma 4 31B.
Sep 1, 2026
1 weeks ago
5mo newerApr 2, 2026
5 months ago
Knowledge Cutoff
When training data ends
Gemma 4 31B has a documented knowledge cutoff of 2025-01-01, while Claude Mythos 5.1's cutoff date is not specified.
We can confirm Gemma 4 31B's training data extends to 2025-01-01, but cannot make a direct comparison without Claude Mythos 5.1's cutoff date.
—
Jan 2025
Provider Availability
Claude Mythos 5.1 is available from Anthropic. Gemma 4 31B is available from DeepInfra, FriendliAI, Novita, Together.
Claude Mythos 5.1
Gemma 4 31B
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Mythos 5.1 and Gemma 4 31B side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Mythos 5.1 vs Gemma 4 31B.