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Claude Fable 5.1 vs GPT-6 Rosalind

Comparing Claude Fable 5.1 and GPT-6 Rosalind across benchmarks, pricing, and capabilities.

Anthropic · OpenAI · Updated for 2026

Which is better?

Claude Fable 5.1 and GPT-6 Rosalind trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, Claude Fable 5.1 is roughly 1.5x 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 Fable 5.1

  • cost matters — it's about 1.5x cheaper per token

Choose GPT-6 Rosalind

  • you want the most recent training data — it shipped Oct 2026

At a glance

The differences that matter most.

Claude Fable 5.1
Anthropic
GPT-6 Rosalind
OpenAI
Benchmark wins
—
—
Input price
$10.00 / M
$15.00 / M
Output price
$50.00 / M
$75.00 / M
Context window
1,000,000
—

Individual benchmarks

7 reported for Claude Fable 5.1 · 0 for GPT-6 Rosalind

No common benchmarks found

Claude Fable 5.1 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

Claude Fable 5.1 costs less

For input processing, Claude Fable 5.1 ($10.00/1M tokens) is 1.5x cheaper than GPT-6 Rosalind ($15.00/1M tokens).

For output processing, Claude Fable 5.1 ($50.00/1M tokens) is 1.5x cheaper than GPT-6 Rosalind ($75.00/1M tokens).

In conclusion, GPT-6 Rosalind is more expensive than Claude Fable 5.1.*

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

Lowest available price from all providers
Tue Nov 03 2026 • llm-stats.com
Anthropic
Claude Fable 5.1
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
OpenAI
GPT-6 Rosalind
Input tokens$15.00
Output tokens$75.00
Best providerOpenAI
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Only Claude Fable 5.1 specifies input context (1,000,000 tokens). Only Claude Fable 5.1 specifies output context (128,000 tokens).

Anthropic
Claude Fable 5.1
Input1,000,000 tokens
Output128,000 tokens
OpenAI
GPT-6 Rosalind
Input- tokens
Output- tokens
Tue Nov 03 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Fable 5.1 and GPT-6 Rosalind support multimodal inputs.

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

Claude Fable 5.1

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 Fable 5.1

Proprietary

Closed source

GPT-6 Rosalind

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while GPT-6 Rosalind was released on 2026-10-30.

GPT-6 Rosalind is 2 months newer than Claude Fable 5.1.

Claude Fable 5.1

Sep 1, 2026

2 months ago

GPT-6 Rosalind

Oct 30, 2026

1 days ago

1mo newer

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 Fable 5.1 is available from Anthropic. GPT-6 Rosalind is available from OpenAI.

Claude Fable 5.1

anthropic logo
Anthropic
Input Price:Input: $10.00/1MOutput Price:Output: $50.00/1M

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 Fable 5.1 and GPT-6 Rosalind side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
GPT-6 Rosalind
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs GPT-6 Rosalind.

Which is better, Claude Fable 5.1 or GPT-6 Rosalind?

Claude Fable 5.1 (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 Fable 5.1 compare to GPT-6 Rosalind in benchmarks?

Claude Fable 5.1 scores OSWorld 2.0: 77.9%, CursorBench v3.2: 73.4%, Humanity's Last Exam: 65.0%, GDPval-AA: 61.8%, Terminal-Bench 4.0: 55.8%.

Is Claude Fable 5.1 cheaper than GPT-6 Rosalind?

Claude Fable 5.1 is 1.5x cheaper for input tokens. Claude Fable 5.1 costs $10.00/M input and $50.00/M output via anthropic. GPT-6 Rosalind costs $15.00/M input and $75.00/M output via openai.

What are the context window sizes for Claude Fable 5.1 and GPT-6 Rosalind?

Claude Fable 5.1 supports 1.0M tokens and GPT-6 Rosalind supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Fable 5.1 and GPT-6 Rosalind?

Key differences include input pricing ($10.00 vs $15.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and GPT-6 Rosalind?

Claude Fable 5.1 is developed by Anthropic and GPT-6 Rosalind is developed by OpenAI.

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