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Claude Mythos Preview vs GPT-6 Rosalind

Comparing Claude Mythos Preview and GPT-6 Rosalind across benchmarks, pricing, and capabilities.

Anthropic · OpenAI · Updated for 2026

Which is better?

Claude Mythos Preview and GPT-6 Rosalind trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, GPT-6 Rosalind is roughly 1.7x 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 Claude Mythos Preview

  • you want predictable pricing at $25.00/M input and $125.00/M output

Choose GPT-6 Rosalind

  • cost matters — it's about 1.7x cheaper per token

At a glance

The differences that matter most.

Claude Mythos Preview
Anthropic
GPT-6 Rosalind
OpenAI
Benchmark wins
—
—
Input price
$25.00 / M
$15.00 / M
Output price
$125.00 / M
$75.00 / M
Context window
—
—

Individual benchmarks

16 reported for Claude Mythos Preview · 0 for GPT-6 Rosalind

No common benchmarks found

Claude Mythos Preview and GPT-6 Rosalinddon'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

GPT-6 Rosalind costs less

For input processing, Claude Mythos Preview ($25.00/1M tokens) is 1.7x more expensive than GPT-6 Rosalind ($15.00/1M tokens).

For output processing, Claude Mythos Preview ($125.00/1M tokens) is 1.7x more expensive than GPT-6 Rosalind ($75.00/1M tokens).

In conclusion, Claude Mythos Preview is more expensive than GPT-6 Rosalind.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Wed Nov 04 2026 • llm-stats.com
Anthropic
Claude Mythos Preview
Input tokens$25.00
Output tokens$125.00
Best providerAnthropic
OpenAI
GPT-6 Rosalind
Input tokens$15.00
Output tokens$75.00
Best providerOpenAI
Notice missing or incorrect data?

Input capabilities

Documented input modalities across available providers

Both Claude Mythos Preview and GPT-6 Rosalind support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Mythos Preview

Text
Images
Audio
Video

GPT-6 Rosalind

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Mythos Preview

Proprietary

Closed source

GPT-6 Rosalind

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-6 Rosalind was released on 2026-10-30, while Claude Mythos Preview's release date is not specified.

We can confirm GPT-6 Rosalind's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Claude Mythos Preview

—

GPT-6 Rosalind

Oct 30, 2026

5 days ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

Claude Mythos Preview is available from Anthropic. GPT-6 Rosalind is available from OpenAI.

Claude Mythos Preview

anthropic logo
Anthropic
Input Price:Input: $25.00/1MOutput Price:Output: $125.00/1M

GPT-6 Rosalind

openai logo
OpenAI
Input Price:Input: $15.00/1MOutput Price:Output: $75.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Mythos Preview and GPT-6 Rosalind side-by-side, then vote on the output you prefer.

Claude Mythos Preview
✓ Preferred
GPT-6 Rosalind
Open in Playground

FAQ

Common questions about Claude Mythos Preview vs GPT-6 Rosalind.

Which is better, Claude Mythos Preview or GPT-6 Rosalind?

Claude Mythos Preview (Anthropic) and GPT-6 Rosalind (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Claude Mythos Preview compare to GPT-6 Rosalind in benchmarks?

Claude Mythos Preview scores CyBench: 100.0%, USAMO25: 97.6%, GPQA: 94.6%, SWE-Bench Verified: 93.9%, CharXiv-R: 93.2%.

Is Claude Mythos Preview cheaper than GPT-6 Rosalind?

GPT-6 Rosalind is 1.7x cheaper for input tokens. Claude Mythos Preview costs $25.00/M input and $125.00/M output via anthropic. GPT-6 Rosalind costs $15.00/M input and $75.00/M output via openai.

What are the main differences between Claude Mythos Preview and GPT-6 Rosalind?

Key differences include input pricing ($25.00 vs $15.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Mythos Preview and GPT-6 Rosalind?

Claude Mythos Preview is developed by Anthropic and GPT-6 Rosalind is developed by OpenAI.

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