Beam 1.0 vs Claude Mythos Preview
Claude Mythos Preview leads the LLM Stats Score 54.5 to 44.6. Beam 1.0 is 83.3x cheaper per token.
Reflection AI · Anthropic · Updated for 2026
Which is better?
Claude Mythos Preview leads the overall LLM Stats Score 54.5 to 44.6, ranking #5 overall.
In the 6 individual benchmarks reported for both models, Claude Mythos Preview wins 6; this is a narrower head-to-head signal than the composite indexes.
On price, Beam 1.0 is roughly 83.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose Beam 1.0
- cost matters — it's about 83.3x cheaper per token
- you need open weights you can self-host or fine-tune
Choose Claude Mythos Preview
- overall performance matters — it scores 54.5 and ranks #5 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 6 of 6 exact shared results
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
22 reported for Beam 1.0 · 16 for Claude Mythos Preview
Beam 1.0 outperforms in 0 benchmarks, while Claude Mythos Preview is better at 6 benchmarks (BrowseComp, GPQA, Humanity's Last Exam, SWE-bench Multilingual, SWE-Bench Pro, SWE-Bench Verified).
Claude Mythos Preview 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, Beam 1.0 ($0.40/1M tokens) is 62.5x cheaper than Claude Mythos Preview ($25.00/1M tokens).
For output processing, Beam 1.0 ($1.20/1M tokens) is 104.2x cheaper than Claude Mythos Preview ($125.00/1M tokens).
In conclusion, Claude Mythos Preview 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
Only Beam 1.0 specifies input context (1,048,576 tokens). Only Beam 1.0 specifies output context (131,072 tokens).
Input capabilities
Documented input modalities across available providers
Claude Mythos Preview supports multimodal inputs, whereas Beam 1.0 does not.
Claude Mythos Preview can handle both text and other forms of data like images, making it suitable for multimodal applications.
Beam 1.0
Claude Mythos Preview
License
Usage and distribution terms
Beam 1.0 is licensed under Apache 2.0, while Claude Mythos Preview 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 Preview's release date is not specified.
We can confirm Beam 1.0's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.
Oct 16, 2026
6 days ago
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Knowledge Cutoff
When training data ends
Beam 1.0 has a documented knowledge cutoff of 2026-06-30, while Claude Mythos Preview'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 Preview's cutoff date.
Jun 2026
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Provider Availability
Beam 1.0 is available from Together, Reflection AI. Claude Mythos Preview is available from Anthropic.
Beam 1.0
Claude Mythos Preview
Outputs Comparison
Judge for yourself.
Run your own prompts against Beam 1.0 and Claude Mythos Preview side-by-side, then vote on the output you prefer.
FAQ
Common questions about Beam 1.0 vs Claude Mythos Preview.