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Claude Fable 5.1 vs Gemini 3.1 Flash-Lite

Claude Fable 5.1 leads the LLM Stats Score 56.9 to 31.2. Gemini 3.1 Flash-Lite is 35.6x cheaper per token.

Anthropic · Google · Updated for 2026

Which is better?

Claude Fable 5.1 leads the overall LLM Stats Score 56.9 to 31.2, ranking #1 overall.

In the 1 individual benchmarks reported for both models, Claude Fable 5.1 wins 1; this is a narrower head-to-head signal than the composite indexes.

On price, Gemini 3.1 Flash-Lite is roughly 35.6x 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

  • overall performance matters — it scores 56.9 and ranks #1 on LLM Stats
  • your work emphasizes reasoning and agents — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Sep 2026

Choose Gemini 3.1 Flash-Lite

  • cost matters — it's about 35.6x cheaper per token

At a glance

The differences that matter most.

Claude Fable 5.1
Anthropic
Gemini 3.1 Flash-Lite
Google
Core performance indexes
LLM Stats Score
56.9
#1
31.2
#104
Reasoning
54.6
#4
31.5
#99
Agents
42.3
#2
11.0
#102
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$10.00 / M
$0.25 / M
Output price
$50.00 / M
$1.50 / M
Context window
1,000,000
1,000,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Fable 5.1
Gemini 3.1 Flash-Lite
Vision
40.8#1
17.5#77
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for Claude Fable 5.1 · 11 for Gemini 3.1 Flash-Lite

1 shared

Claude Fable 5.1 outperforms in 1 benchmarks (Humanity's Last Exam), while Gemini 3.1 Flash-Lite is better at 0 benchmarks.

Claude Fable 5.1 significantly outperforms across most benchmarks.

Wed Sep 02 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Gemini 3.1 Flash-Lite costs less

For input processing, Claude Fable 5.1 ($10.00/1M tokens) is 40.0x more expensive than Gemini 3.1 Flash-Lite ($0.25/1M tokens).

For output processing, Claude Fable 5.1 ($50.00/1M tokens) is 33.3x more expensive than Gemini 3.1 Flash-Lite ($1.50/1M tokens).

In conclusion, Claude Fable 5.1 is more expensive than Gemini 3.1 Flash-Lite.*

* 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 3.1 Flash-Lite
Input tokens$0.25
Output tokens$1.50
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Both models have the same input context window of 1,000,000 tokens. Claude Fable 5.1 can generate longer responses up to 128,000 tokens, while Gemini 3.1 Flash-Lite is limited to 65,536 tokens.

Anthropic
Claude Fable 5.1
Input1,000,000 tokens
Output128,000 tokens
Google
Gemini 3.1 Flash-Lite
Input1,000,000 tokens
Output65,536 tokens
Wed Sep 02 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Fable 5.1 and Gemini 3.1 Flash-Lite 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 3.1 Flash-Lite

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 3.1 Flash-Lite

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while Gemini 3.1 Flash-Lite was released on 2026-03-03.

Claude Fable 5.1 is 6 months newer than Gemini 3.1 Flash-Lite.

Claude Fable 5.1

Sep 1, 2026

1 days ago

6mo newer
Gemini 3.1 Flash-Lite

Mar 3, 2026

6 months ago

Knowledge Cutoff

When training data ends

Gemini 3.1 Flash-Lite has a documented knowledge cutoff of 2025-01-31, while Claude Fable 5.1's cutoff date is not specified.

We can confirm Gemini 3.1 Flash-Lite's training data extends to 2025-01-31, but cannot make a direct comparison without Claude Fable 5.1's cutoff date.

Claude Fable 5.1

—

Gemini 3.1 Flash-Lite

Jan 2025

Provider Availability

Claude Fable 5.1 is available from Anthropic. Gemini 3.1 Flash-Lite is available from Google.

Claude Fable 5.1

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

Gemini 3.1 Flash-Lite

google logo
Google
Input Price:Input: $0.25/1MOutput Price:Output: $1.50/1M
* 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 3.1 Flash-Lite side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
Gemini 3.1 Flash-Lite
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs Gemini 3.1 Flash-Lite.

Which is better, Claude Fable 5.1 or Gemini 3.1 Flash-Lite?

Claude Fable 5.1 leads the LLM Stats Score 56.9 to 31.2. Claude Fable 5.1 is made by Anthropic and Gemini 3.1 Flash-Lite 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 3.1 Flash-Lite 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 3.1 Flash-Lite scores MMMLU: 88.9%, GPQA: 86.9%, VideoMMMU: 84.8%, MMMU-Pro: 76.8%, CharXiv-R: 73.2%.

Is Claude Fable 5.1 cheaper than Gemini 3.1 Flash-Lite?

Gemini 3.1 Flash-Lite is 40.0x cheaper for input tokens. Claude Fable 5.1 costs $10.00/M input and $50.00/M output via anthropic. Gemini 3.1 Flash-Lite costs $0.25/M input and $1.50/M output via google.

What are the context window sizes for Claude Fable 5.1 and Gemini 3.1 Flash-Lite?

Claude Fable 5.1 supports 1.0M tokens and Gemini 3.1 Flash-Lite 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 Claude Fable 5.1 and Gemini 3.1 Flash-Lite?

Key differences include LLM Stats Score (56.9 vs 31.2), input pricing ($10.00 vs $0.25/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and Gemini 3.1 Flash-Lite?

Claude Fable 5.1 is developed by Anthropic and Gemini 3.1 Flash-Lite is developed by Google.

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