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Claude Fable 5.1 vs Gemini 1.5 Pro

Claude Fable 5.1 leads the LLM Stats Score 54.8 to 12.2. Gemini 1.5 Pro is 4.6x cheaper per token.

Anthropic · Google · Updated for 2026

Which is better?

Claude Fable 5.1 leads the overall LLM Stats Score 54.8 to 12.2, ranking #5 overall.

On price, Gemini 1.5 Pro is roughly 4.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Gemini 1.5 Pro also accepts a larger context window (2,097,152 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 54.8 and ranks #5 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Gemini 1.5 Pro

  • cost matters — it's about 4.6x cheaper per token
  • you process long inputs — it offers a 2,097,152 token context window

At a glance

The differences that matter most.

Claude Fable 5.1
Anthropic
Gemini 1.5 Pro
Google
Core performance indexes
LLM Stats Score
54.8
#5
12.2
#240
Reasoning
52.1
#7
12.0
#234
Cost, coverage & limits
Benchmark wins
—
—
Input price
$10.00 / M
$2.50 / M
Output price
$50.00 / M
$10.00 / M
Context window
1,000,000
2,097,152

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Fable 5.1
Gemini 1.5 Pro
Vision
40.5#1
9.7#122
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for Claude Fable 5.1 · 23 for Gemini 1.5 Pro

No common benchmarks found

Claude Fable 5.1 and Gemini 1.5 Prodon'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

Gemini 1.5 Pro costs less

For input processing, Claude Fable 5.1 ($10.00/1M tokens) is 4.0x more expensive than Gemini 1.5 Pro ($2.50/1M tokens).

For output processing, Claude Fable 5.1 ($50.00/1M tokens) is 5.0x more expensive than Gemini 1.5 Pro ($10.00/1M tokens).

In conclusion, Claude Fable 5.1 is more expensive than Gemini 1.5 Pro.*

* 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
Google
Gemini 1.5 Pro
Input tokens$2.50
Output tokens$10.00
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 1.5 Pro accepts 2,097,152 input tokens compared to Claude Fable 5.1's 1,000,000 tokens. Claude Fable 5.1 can generate longer responses up to 128,000 tokens, while Gemini 1.5 Pro is limited to 8,192 tokens.

Anthropic
Claude Fable 5.1
Input1,000,000 tokens
Output128,000 tokens
Google
Gemini 1.5 Pro
Input2,097,152 tokens
Output8,192 tokens
Wed Sep 02 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Fable 5.1 and Gemini 1.5 Pro 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

Gemini 1.5 Pro

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

Gemini 1.5 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while Gemini 1.5 Pro was released on 2024-05-01.

Claude Fable 5.1 is 28 months newer than Gemini 1.5 Pro.

Claude Fable 5.1

Sep 1, 2026

1 days ago

2.3yr newer
Gemini 1.5 Pro

May 1, 2024

2.3 years ago

Knowledge Cutoff

When training data ends

Gemini 1.5 Pro has a documented knowledge cutoff of 2023-11-01, while Claude Fable 5.1's cutoff date is not specified.

We can confirm Gemini 1.5 Pro's training data extends to 2023-11-01, but cannot make a direct comparison without Claude Fable 5.1's cutoff date.

Claude Fable 5.1

—

Gemini 1.5 Pro

Nov 2023

Provider Availability

Claude Fable 5.1 is available from Anthropic. Gemini 1.5 Pro is available from Google.

Claude Fable 5.1

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

Gemini 1.5 Pro

google logo
Google
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M
* 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 Gemini 1.5 Pro side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
Gemini 1.5 Pro
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs Gemini 1.5 Pro.

Which is better, Claude Fable 5.1 or Gemini 1.5 Pro?

Claude Fable 5.1 leads the LLM Stats Score 54.8 to 12.2. Claude Fable 5.1 is made by Anthropic and Gemini 1.5 Pro is made by Google. 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 Gemini 1.5 Pro 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%. Gemini 1.5 Pro scores XSTest: 98.8%, FLEURS: 93.3%, HellaSwag: 93.3%, GSM8k: 90.8%, BIG-Bench Hard: 89.2%.

Is Claude Fable 5.1 cheaper than Gemini 1.5 Pro?

Gemini 1.5 Pro is 4.0x cheaper for input tokens. Claude Fable 5.1 costs $10.00/M input and $50.00/M output via anthropic. Gemini 1.5 Pro costs $2.50/M input and $10.00/M output via google.

What are the context window sizes for Claude Fable 5.1 and Gemini 1.5 Pro?

Claude Fable 5.1 supports 1.0M tokens and Gemini 1.5 Pro supports 2.1M 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 Gemini 1.5 Pro?

Key differences include LLM Stats Score (54.8 vs 12.2), context window (1.0M vs 2.1M), input pricing ($10.00 vs $2.50/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and Gemini 1.5 Pro?

Claude Fable 5.1 is developed by Anthropic and Gemini 1.5 Pro is developed by Google.

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