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ChatGPT-4o Latest vs Claude Fable 5.1

Claude Fable 5.1 leads the LLM Stats Score 56.3 to 25.0. ChatGPT-4o Latest is 4.6x cheaper per token.

OpenAI · Anthropic · Updated for 2026

Which is better?

Claude Fable 5.1 leads the overall LLM Stats Score 56.3 to 25.0, ranking #2 overall.

On price, ChatGPT-4o Latest is roughly 4.6x 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 ChatGPT-4o Latest

  • cost matters — it's about 4.6x cheaper per token

Choose Claude Fable 5.1

  • overall performance matters — it scores 56.3 and ranks #2 on LLM Stats
  • your work emphasizes reasoning — 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

At a glance

The differences that matter most.

ChatGPT-4o Latest
OpenAI
Claude Fable 5.1
Anthropic
Core performance indexes
LLM Stats Score
25.0
#157
56.3
#2
Reasoning
24.1
#158
53.3
#5
Cost, coverage & limits
Benchmark wins
—
—
Input price
$2.50 / M
$10.00 / M
Output price
$10.00 / M
$50.00 / M
Context window
128,000
1,000,000

Individual benchmarks

1 reported for ChatGPT-4o Latest · 7 for Claude Fable 5.1

No common benchmarks found

ChatGPT-4o Latest and Claude Fable 5.1don'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

ChatGPT-4o Latest costs less

For input processing, ChatGPT-4o Latest ($2.50/1M tokens) is 4.0x cheaper than Claude Fable 5.1 ($10.00/1M tokens).

For output processing, ChatGPT-4o Latest ($10.00/1M tokens) is 5.0x cheaper than Claude Fable 5.1 ($50.00/1M tokens).

In conclusion, Claude Fable 5.1 is more expensive than ChatGPT-4o Latest.*

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

Lowest available price from all providers
Thu Sep 10 2026 • llm-stats.com
OpenAI
ChatGPT-4o Latest
Input tokens$2.50
Output tokens$10.00
Best providerOpenAI
Anthropic
Claude Fable 5.1
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
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 ChatGPT-4o Latest's 128,000 tokens. Claude Fable 5.1 can generate longer responses up to 128,000 tokens, while ChatGPT-4o Latest is limited to 16,384 tokens.

OpenAI
ChatGPT-4o Latest
Input128,000 tokens
Output16,384 tokens
Anthropic
Claude Fable 5.1
Input1,000,000 tokens
Output128,000 tokens
Thu Sep 10 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both ChatGPT-4o Latest and Claude Fable 5.1 support multimodal inputs.

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

ChatGPT-4o Latest

Text
Images
Audio
Video

Claude Fable 5.1

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.

ChatGPT-4o Latest

Proprietary

Closed source

Claude Fable 5.1

Proprietary

Closed source

Release Timeline

When each model was launched

ChatGPT-4o Latest was released on 2024-05-13, while Claude Fable 5.1 was released on 2026-09-01.

Claude Fable 5.1 is 28 months newer than ChatGPT-4o Latest.

ChatGPT-4o Latest

May 13, 2024

2.3 years ago

Claude Fable 5.1

Sep 1, 2026

1 weeks ago

2.3yr 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

ChatGPT-4o Latest is available from OpenAI. Claude Fable 5.1 is available from Anthropic.

ChatGPT-4o Latest

openai logo
OpenAI
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M

Claude Fable 5.1

anthropic logo
Anthropic
Input Price:Input: $10.00/1MOutput Price:Output: $50.00/1M
* 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 ChatGPT-4o Latest and Claude Fable 5.1 side-by-side, then vote on the output you prefer.

ChatGPT-4o Latest
✓ Preferred
Claude Fable 5.1
Open in Playground

FAQ

Common questions about ChatGPT-4o Latest vs Claude Fable 5.1.

Which is better, ChatGPT-4o Latest or Claude Fable 5.1?

Claude Fable 5.1 leads the LLM Stats Score 56.3 to 25.0. ChatGPT-4o Latest is made by OpenAI and Claude Fable 5.1 is made by Anthropic. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does ChatGPT-4o Latest compare to Claude Fable 5.1 in benchmarks?

ChatGPT-4o Latest scores GPQA: 84.0%. 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 ChatGPT-4o Latest cheaper than Claude Fable 5.1?

ChatGPT-4o Latest is 4.0x cheaper for input tokens. ChatGPT-4o Latest costs $2.50/M input and $10.00/M output via openai. Claude Fable 5.1 costs $10.00/M input and $50.00/M output via anthropic.

What are the context window sizes for ChatGPT-4o Latest and Claude Fable 5.1?

ChatGPT-4o Latest supports 128K tokens and Claude Fable 5.1 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between ChatGPT-4o Latest and Claude Fable 5.1?

Key differences include LLM Stats Score (25.0 vs 56.3), context window (128K vs 1.0M), input pricing ($2.50 vs $10.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes ChatGPT-4o Latest and Claude Fable 5.1?

ChatGPT-4o Latest is developed by OpenAI and Claude Fable 5.1 is developed by Anthropic.

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