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Claude Fable 5.1 vs o1

Claude Fable 5.1 leads the LLM Stats Score 56.9 to 21.2. Claude Fable 5.1 is 1.3x cheaper per token.

Anthropic · OpenAI · Updated for 2026

Which is better?

Claude Fable 5.1 leads the overall LLM Stats Score 56.9 to 21.2, ranking #1 overall.

On price, Claude Fable 5.1 is roughly 1.3x 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

  • overall performance matters — it scores 56.9 and ranks #1 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • cost matters — it's about 1.3x 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 o1

  • you want predictable pricing at $15.00/M input and $60.00/M output

At a glance

The differences that matter most.

Claude Fable 5.1
Anthropic
o1
OpenAI
Core performance indexes
LLM Stats Score
56.9
#1
21.2
#180
Reasoning
54.6
#4
21.5
#169
Coding
37.8
#15
4.8
#195
Cost, coverage & limits
Benchmark wins
—
—
Input price
$10.00 / M
$15.00 / M
Output price
$50.00 / M
$60.00 / M
Context window
1,000,000
200,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

2 shared
Index
Claude Fable 5.1
o1
Vision
40.8#1
13.0#94
Tool use
32.9#7
13.0#94
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for Claude Fable 5.1 · 19 for o1

No common benchmarks found

Claude Fable 5.1 and o1don'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 o1 ($15.00/1M tokens).

For output processing, Claude Fable 5.1 ($50.00/1M tokens) is 1.2x cheaper than o1 ($60.00/1M tokens).

In conclusion, o1 is more expensive than Claude Fable 5.1.*

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

Lowest available price from all providers
Wed Sep 02 2026 • llm-stats.com
Anthropic
Claude Fable 5.1
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
OpenAI
o1
Input tokens$15.00
Output tokens$60.00
Best providerAzure
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 o1's 200,000 tokens. Claude Fable 5.1 can generate longer responses up to 128,000 tokens, while o1 is limited to 100,000 tokens.

Anthropic
Claude Fable 5.1
Input1,000,000 tokens
Output128,000 tokens
OpenAI
o1
Input200,000 tokens
Output100,000 tokens
Wed Sep 02 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Claude Fable 5.1 supports multimodal inputs, whereas o1 does not.

Claude Fable 5.1 can handle both text and other forms of data like images, making it suitable for multimodal applications.

Claude Fable 5.1

Text
Images
Audio
Video

o1

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

o1

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while o1 was released on 2024-12-17.

Claude Fable 5.1 is 21 months newer than o1.

Claude Fable 5.1

Sep 1, 2026

1 days ago

1.7yr newer
o1

Dec 17, 2024

1.7 years 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 Fable 5.1 is available from Anthropic. o1 is available from Azure, OpenAI.

Claude Fable 5.1

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

o1

azure logo
Azure
Input Price:Input: $15.00/1MOutput Price:Output: $60.00/1M
openai logo
OpenAI
Input Price:Input: $15.00/1MOutput Price:Output: $60.00/1M
* 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 o1 side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
o1
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs o1.

Which is better, Claude Fable 5.1 or o1?

Claude Fable 5.1 leads the LLM Stats Score 56.9 to 21.2. Claude Fable 5.1 is made by Anthropic and o1 is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Fable 5.1 compare to o1 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%. o1 scores GSM8k: 97.1%, MATH: 96.4%, GPQA Physics: 92.8%, MMLU: 91.8%, MGSM: 89.3%.

Is Claude Fable 5.1 cheaper than o1?

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. o1 costs $15.00/M input and $60.00/M output via azure.

What are the context window sizes for Claude Fable 5.1 and o1?

Claude Fable 5.1 supports 1.0M tokens and o1 supports 200K 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 o1?

Key differences include LLM Stats Score (56.9 vs 21.2), context window (1.0M vs 200K), input pricing ($10.00 vs $15.00/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and o1?

Claude Fable 5.1 is developed by Anthropic and o1 is developed by OpenAI.

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