Claude Mythos 5.1 vs Jamba 1.5 Mini
Claude Mythos 5.1 leads the LLM Stats Score 45.1 to -5.6. Jamba 1.5 Mini is 80.0x cheaper per token.
Anthropic · AI21 Labs · Updated for 2026
Which is better?
Claude Mythos 5.1 leads the overall LLM Stats Score 45.1 to -5.6, ranking #31 overall.
On price, Jamba 1.5 Mini is roughly 80.0x 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 — 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 Jamba 1.5 Mini
- cost matters — it's about 80.0x 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 · 8 for Jamba 1.5 Mini
Claude Mythos 5.1 and Jamba 1.5 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 50.0x more expensive than Jamba 1.5 Mini ($0.20/1M tokens).
For output processing, Claude Mythos 5.1 ($50.00/1M tokens) is 125.0x more expensive than Jamba 1.5 Mini ($0.40/1M tokens).
In conclusion, Claude Mythos 5.1 is more expensive than Jamba 1.5 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 Jamba 1.5 Mini's 256,144 tokens. Jamba 1.5 Mini can generate longer responses up to 256,144 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 Jamba 1.5 Mini does not.
Claude Mythos 5.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.
Claude Mythos 5.1
Jamba 1.5 Mini
License
Usage and distribution terms
Claude Mythos 5.1 is licensed under a proprietary license, while Jamba 1.5 Mini uses Jamba Open Model License.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Jamba Open Model License
Open weights
Release Timeline
When each model was launched
Claude Mythos 5.1 was released on 2026-09-01, while Jamba 1.5 Mini was released on 2024-08-22.
Claude Mythos 5.1 is 25 months newer than Jamba 1.5 Mini.
Sep 1, 2026
1 weeks ago
2.0yr newerAug 22, 2024
2.1 years ago
Knowledge Cutoff
When training data ends
Jamba 1.5 Mini has a documented knowledge cutoff of 2024-03-05, while Claude Mythos 5.1's cutoff date is not specified.
We can confirm Jamba 1.5 Mini's training data extends to 2024-03-05, but cannot make a direct comparison without Claude Mythos 5.1's cutoff date.
—
Mar 2024
Provider Availability
Claude Mythos 5.1 is available from Anthropic. Jamba 1.5 Mini is available from Bedrock, Google.
Claude Mythos 5.1
Jamba 1.5 Mini
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Mythos 5.1 and Jamba 1.5 Mini side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Mythos 5.1 vs Jamba 1.5 Mini.