Beam 1.0 vs Claude Mythos 5.1
Beam 1.0 and Claude Mythos 5.1 are closely matched at 44.6 and 44.3 on the LLM Stats Score. Beam 1.0 is 33.3x cheaper per token.
Reflection AI · Anthropic · Updated for 2026
Which is better?
Beam 1.0 and Claude Mythos 5.1 are closely matched on the overall LLM Stats Score at 44.6 and 44.3.
On price, Beam 1.0 is roughly 33.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Beam 1.0 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 Beam 1.0
- cost matters — it's about 33.3x 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 Oct 2026
- you need open weights you can self-host or fine-tune
Choose Claude Mythos 5.1
- your work emphasizes agents — it leads those capability indexes
At a glance
The differences that matter most.
Individual benchmarks
22 reported for Beam 1.0 · 1 for Claude Mythos 5.1
Beam 1.0 and Claude Mythos 5.1don'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, Beam 1.0 ($0.40/1M tokens) is 25.0x cheaper than Claude Mythos 5.1 ($10.00/1M tokens).
For output processing, Beam 1.0 ($1.20/1M tokens) is 41.7x cheaper than Claude Mythos 5.1 ($50.00/1M tokens).
In conclusion, Claude Mythos 5.1 is more expensive than Beam 1.0.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Beam 1.0 accepts 1,048,576 input tokens compared to Claude Mythos 5.1's 1,000,000 tokens. Beam 1.0 can generate longer responses up to 131,072 tokens, while Claude Mythos 5.1 is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Claude Mythos 5.1 supports multimodal inputs, whereas Beam 1.0 does not.
Claude Mythos 5.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Beam 1.0
Claude Mythos 5.1
License
Usage and distribution terms
Beam 1.0 is licensed under Apache 2.0, while Claude Mythos 5.1 uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
Apache 2.0
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
Beam 1.0 was released on 2026-10-16, while Claude Mythos 5.1 was released on 2026-09-01.
Beam 1.0 is 2 months newer than Claude Mythos 5.1.
Oct 16, 2026
6 days ago
1mo newerSep 1, 2026
1 months ago
Knowledge Cutoff
When training data ends
Beam 1.0 has a documented knowledge cutoff of 2026-06-30, while Claude Mythos 5.1's cutoff date is not specified.
We can confirm Beam 1.0's training data extends to 2026-06-30, but cannot make a direct comparison without Claude Mythos 5.1's cutoff date.
Jun 2026
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Provider Availability
Beam 1.0 is available from Together, Reflection AI. Claude Mythos 5.1 is available from Anthropic.
Beam 1.0
Claude Mythos 5.1
Outputs Comparison
Judge for yourself.
Run your own prompts against Beam 1.0 and Claude Mythos 5.1 side-by-side, then vote on the output you prefer.
FAQ
Common questions about Beam 1.0 vs Claude Mythos 5.1.