Claude Mythos 5.1 vs Seed 2.0 Mini
Claude Mythos 5.1 leads the LLM Stats Score 45.1 to 27.9. Seed 2.0 Mini is 114.3x cheaper per token.
Anthropic · ByteDance · Updated for 2026
Which is better?
Claude Mythos 5.1 leads the overall LLM Stats Score 45.1 to 27.9, ranking #31 overall.
On price, Seed 2.0 Mini is roughly 114.3x 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 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 Seed 2.0 Mini
- cost matters — it's about 114.3x cheaper per token
At a glance
The differences that matter most.
Individual benchmarks
1 reported for Claude Mythos 5.1 · 83 for Seed 2.0 Mini
Claude Mythos 5.1 and Seed 2.0 Minidon'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 100.0x more expensive than Seed 2.0 Mini ($0.10/1M tokens).
For output processing, Claude Mythos 5.1 ($50.00/1M tokens) is 125.0x more expensive than Seed 2.0 Mini ($0.40/1M tokens).
In conclusion, Claude Mythos 5.1 is more expensive than Seed 2.0 Mini.*
* 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 Seed 2.0 Mini's 256,000 tokens. Seed 2.0 Mini can generate longer responses up to 256,000 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 Seed 2.0 Mini support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Claude Mythos 5.1
Seed 2.0 Mini
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 Seed 2.0 Mini was released on 2026-02-17.
Claude Mythos 5.1 is 7 months newer than Seed 2.0 Mini.
Sep 1, 2026
1 weeks ago
6mo newerFeb 17, 2026
6 months 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. Seed 2.0 Mini is available from DeepInfra.
Claude Mythos 5.1
Seed 2.0 Mini
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Mythos 5.1 and Seed 2.0 Mini side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Mythos 5.1 vs Seed 2.0 Mini.