Claude Mythos 5.1 vs GPT-3.5 Turbo
Claude Mythos 5.1 leads the LLM Stats Score 45.1 to -9.3. GPT-3.5 Turbo is 26.7x cheaper per token.
Anthropic · OpenAI · Updated for 2026
Which is better?
Claude Mythos 5.1 leads the overall LLM Stats Score 45.1 to -9.3, ranking #31 overall.
On price, GPT-3.5 Turbo is roughly 26.7x 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 GPT-3.5 Turbo
- cost matters — it's about 26.7x cheaper per token
At a glance
The differences that matter most.
Individual benchmarks
1 reported for Claude Mythos 5.1 · 8 for GPT-3.5 Turbo
Claude Mythos 5.1 and GPT-3.5 Turbodon'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 20.0x more expensive than GPT-3.5 Turbo ($0.50/1M tokens).
For output processing, Claude Mythos 5.1 ($50.00/1M tokens) is 33.3x more expensive than GPT-3.5 Turbo ($1.50/1M tokens).
In conclusion, Claude Mythos 5.1 is more expensive than GPT-3.5 Turbo.*
* 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 GPT-3.5 Turbo's 16,385 tokens. Claude Mythos 5.1 can generate longer responses up to 128,000 tokens, while GPT-3.5 Turbo is limited to 4,096 tokens.
Input capabilities
Documented input modalities across available providers
Claude Mythos 5.1 supports multimodal inputs, whereas GPT-3.5 Turbo 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
GPT-3.5 Turbo
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 GPT-3.5 Turbo was released on 2023-03-21.
Claude Mythos 5.1 is 42 months newer than GPT-3.5 Turbo.
Sep 1, 2026
1 weeks ago
3.5yr newerMar 21, 2023
3.5 years ago
Knowledge Cutoff
When training data ends
GPT-3.5 Turbo has a documented knowledge cutoff of 2021-09-30, while Claude Mythos 5.1's cutoff date is not specified.
We can confirm GPT-3.5 Turbo's training data extends to 2021-09-30, but cannot make a direct comparison without Claude Mythos 5.1's cutoff date.
—
Sep 2021
Provider Availability
Claude Mythos 5.1 is available from Anthropic. GPT-3.5 Turbo is available from Azure, OpenAI.
Claude Mythos 5.1
GPT-3.5 Turbo
Outputs Comparison
Judge for yourself.
Run your own prompts against Claude Mythos 5.1 and GPT-3.5 Turbo side-by-side, then vote on the output you prefer.
FAQ
Common questions about Claude Mythos 5.1 vs GPT-3.5 Turbo.