Claude Mythos 5.1 vs Gemini 4 Argon
Claude Mythos 5.1 and Gemini 4 Argon are closely matched at 44.3 and 55.1 on the LLM Stats Score. Gemini 4 Argon is 5.0x cheaper per token.
Anthropic · Google · Updated for 2026
Which is better?
Claude Mythos 5.1 and Gemini 4 Argon are closely matched on the overall LLM Stats Score at 44.3 and 55.1.
In the 1 individual benchmarks reported for both models, Claude Mythos 5.1 wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, Gemini 4 Argon is roughly 5.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Gemini 4 Argon also accepts a larger context window (1,048,576 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
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
Choose Gemini 4 Argon
- cost matters — it's about 5.0x cheaper per token
- you process long inputs — it offers a 1,048,576 token context window
- you want the most recent training data — it shipped Sep 2026
At a glance
The differences that matter most.
Individual benchmarks
1 reported for Claude Mythos 5.1 · 19 for Gemini 4 Argon
Claude Mythos 5.1 outperforms in 1 benchmarks (Terminal-Bench 4.0), while Gemini 4 Argon is better at 0 benchmarks.
Claude Mythos 5.1 significantly outperforms across most benchmarks.
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 5.0x more expensive than Gemini 4 Argon ($2.00/1M tokens).
For output processing, Claude Mythos 5.1 ($50.00/1M tokens) is 5.0x more expensive than Gemini 4 Argon ($10.00/1M tokens).
In conclusion, Claude Mythos 5.1 is more expensive than Gemini 4 Argon.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Gemini 4 Argon accepts 1,048,576 input tokens compared to Claude Mythos 5.1's 1,000,000 tokens. Gemini 4 Argon can generate longer responses up to 1,048,576 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 Gemini 4 Argon support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Mythos 5.1
Gemini 4 Argon
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 Gemini 4 Argon was released on 2026-09-30.
Gemini 4 Argon is 1 month newer than Claude Mythos 5.1.
Sep 1, 2026
1 months ago
Sep 30, 2026
2 weeks ago
4w newerKnowledge 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. Gemini 4 Argon is available from Google.
Claude Mythos 5.1
Gemini 4 Argon
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Mythos 5.1 and Gemini 4 Argon side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Mythos 5.1 vs Gemini 4 Argon.