The AI arena is free today

Open Superagent

Claude Fable 5.1 vs GPT-5.6 Cyber

Comparing Claude Fable 5.1 and GPT-5.6 Cyber across benchmarks, pricing, and capabilities.

Anthropic · OpenAI · Updated for 2026

Which is better?

Claude Fable 5.1 and GPT-5.6 Cyber trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.

On price, Claude Fable 5.1 is roughly 1.4x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Fable 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 Fable 5.1

  • cost matters — it's about 1.4x cheaper per token
  • 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-5.6 Cyber

  • you want predictable pricing at $12.50/M input and $75.00/M output

At a glance

The differences that matter most.

Claude Fable 5.1
Anthropic
GPT-5.6 Cyber
OpenAI
Benchmark wins
—
—
Input price
$10.00 / M
$12.50 / M
Output price
$50.00 / M
$75.00 / M
Context window
1,000,000
400,000

Individual benchmarks

7 reported for Claude Fable 5.1 · 0 for GPT-5.6 Cyber

No common benchmarks found

Claude Fable 5.1 and GPT-5.6 Cyberdon'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 1.3x cheaper than GPT-5.6 Cyber ($12.50/1M tokens).

For output processing, Claude Fable 5.1 ($50.00/1M tokens) is 1.5x cheaper than GPT-5.6 Cyber ($75.00/1M tokens).

In conclusion, GPT-5.6 Cyber is more expensive than Claude Fable 5.1.*

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

Lowest available price from all providers
Mon Sep 14 2026 • llm-stats.com
Anthropic
Claude Fable 5.1
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
OpenAI
GPT-5.6 Cyber
Input tokens$12.50
Output tokens$75.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Fable 5.1 accepts 1,000,000 input tokens compared to GPT-5.6 Cyber's 400,000 tokens. Both models can generate responses up to 128,000 tokens.

Anthropic
Claude Fable 5.1
Input1,000,000 tokens
Output128,000 tokens
OpenAI
GPT-5.6 Cyber
Input400,000 tokens
Output128,000 tokens
Mon Sep 14 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Fable 5.1 and GPT-5.6 Cyber 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-5.6 Cyber

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-5.6 Cyber

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while GPT-5.6 Cyber was released on 2026-08-10.

Claude Fable 5.1 is 1 month newer than GPT-5.6 Cyber.

Claude Fable 5.1

Sep 1, 2026

1 weeks ago

3w newer
GPT-5.6 Cyber

Aug 10, 2026

1 months ago

Knowledge Cutoff

When training data ends

GPT-5.6 Cyber has a documented knowledge cutoff of 2026-02-16, while Claude Fable 5.1's cutoff date is not specified.

We can confirm GPT-5.6 Cyber's training data extends to 2026-02-16, but cannot make a direct comparison without Claude Fable 5.1's cutoff date.

Claude Fable 5.1

—

GPT-5.6 Cyber

Feb 2026

Provider Availability

Claude Fable 5.1 is available from Anthropic. GPT-5.6 Cyber is available from OpenAI.

Claude Fable 5.1

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

GPT-5.6 Cyber

openai logo
OpenAI
Input Price:Input: $12.50/1MOutput Price:Output: $75.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Claude Fable 5.1 and GPT-5.6 Cyber side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
GPT-5.6 Cyber
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs GPT-5.6 Cyber.

Which is better, Claude Fable 5.1 or GPT-5.6 Cyber?

Claude Fable 5.1 (Anthropic) and GPT-5.6 Cyber (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-5.6 Cyber 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-5.6 Cyber?

Claude Fable 5.1 is 1.3x cheaper for input tokens. Claude Fable 5.1 costs $10.00/M input and $50.00/M output via anthropic. GPT-5.6 Cyber costs $12.50/M input and $75.00/M output via openai.

What are the context window sizes for Claude Fable 5.1 and GPT-5.6 Cyber?

Claude Fable 5.1 supports 1.0M tokens and GPT-5.6 Cyber supports 400K 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-5.6 Cyber?

Key differences include context window (1.0M vs 400K), input pricing ($10.00 vs $12.50/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and GPT-5.6 Cyber?

Claude Fable 5.1 is developed by Anthropic and GPT-5.6 Cyber is developed by OpenAI.

Related comparisons