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Claude Fable 5.1 vs Qwen3.8 Flash

Claude Fable 5.1 leads the LLM Stats Score 54.8 to 49.6. Qwen3.8 Flash is 87.0x cheaper per token.

Anthropic · Alibaba Cloud / Qwen Team · Updated for 2026

Which is better?

Claude Fable 5.1 leads the overall LLM Stats Score 54.8 to 49.6, ranking #5 overall.

In the 2 individual benchmarks reported for both models, Claude Fable 5.1 wins 2; this is a narrower head-to-head signal than the composite indexes.

On price, Qwen3.8 Flash is roughly 87.0x 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 54.8 and ranks #5 on LLM Stats
  • you value its reported benchmark strengths — it wins 2 of 2 exact shared results
  • you want the most recent training data — it shipped Sep 2026

Choose Qwen3.8 Flash

  • cost matters — it's about 87.0x cheaper per token

At a glance

The differences that matter most.

Claude Fable 5.1
Anthropic
Qwen3.8 Flash
Alibaba Cloud / Qwen Team
Core performance indexes
LLM Stats Score
54.8
#5
49.6
#17
Reasoning
52.1
#7
49.2
#17
Agents
39.3
#6
35.4
#16
Cost, coverage & limits
Benchmark wins
2 of 2
0 of 2
Input price
$10.00 / M
$0.15 / M
Output price
$50.00 / M
$0.47 / 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
Qwen3.8 Flash
Vision
40.5#1
34.1#14
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

7 reported for Claude Fable 5.1 · 22 for Qwen3.8 Flash

2 shared

Claude Fable 5.1 outperforms in 2 benchmarks (Humanity's Last Exam, OSWorld 2.0), while Qwen3.8 Flash is better at 0 benchmarks.

Claude Fable 5.1 significantly outperforms across most benchmarks.

Tue Sep 01 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Qwen3.8 Flash costs less

For input processing, Claude Fable 5.1 ($10.00/1M tokens) is 66.7x more expensive than Qwen3.8 Flash ($0.15/1M tokens).

For output processing, Claude Fable 5.1 ($50.00/1M tokens) is 106.4x more expensive than Qwen3.8 Flash ($0.47/1M tokens).

In conclusion, Claude Fable 5.1 is more expensive than Qwen3.8 Flash.*

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

Lowest available price from all providers
Tue Sep 01 2026 • llm-stats.com
Anthropic
Claude Fable 5.1
Input tokens$10.00
Output tokens$50.00
Best providerAnthropic
Alibaba Cloud / Qwen Team
Qwen3.8 Flash
Input tokens$0.15
Output tokens$0.47
Best providerNovita
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. Qwen3.8 Flash can generate longer responses up to 131,072 tokens, while Claude Fable 5.1 is limited to 128,000 tokens.

Anthropic
Claude Fable 5.1
Input1,000,000 tokens
Output128,000 tokens
Alibaba Cloud / Qwen Team
Qwen3.8 Flash
Input1,000,000 tokens
Output131,072 tokens
Tue Sep 01 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Fable 5.1 and Qwen3.8 Flash 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

Qwen3.8 Flash

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

Qwen3.8 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Fable 5.1 was released on 2026-09-01, while Qwen3.8 Flash was released on 2026-08-26.

Claude Fable 5.1 is 0 month newer than Qwen3.8 Flash.

Claude Fable 5.1

Sep 1, 2026

0 days ago

6d newer
Qwen3.8 Flash

Aug 26, 2026

6 days 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. Qwen3.8 Flash is available from Novita.

Claude Fable 5.1

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

Qwen3.8 Flash

novita logo
Novita
Input Price:Input: $0.15/1MOutput Price:Output: $0.47/1M
* 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 Qwen3.8 Flash side-by-side, then vote on the output you prefer.

Claude Fable 5.1
✓ Preferred
Qwen3.8 Flash
Open in Playground

FAQ

Common questions about Claude Fable 5.1 vs Qwen3.8 Flash.

Which is better, Claude Fable 5.1 or Qwen3.8 Flash?

Claude Fable 5.1 leads the LLM Stats Score 54.8 to 49.6. Claude Fable 5.1 is made by Anthropic and Qwen3.8 Flash is made by Alibaba Cloud / Qwen Team. 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 Qwen3.8 Flash 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%. Qwen3.8 Flash scores MathVision: 95.7%, LiveCodeBench v6: 91.9%, GPQA: 91.7%, CharXiv-R: 90.6%, RealWorldQA: 88.5%.

Is Claude Fable 5.1 cheaper than Qwen3.8 Flash?

Qwen3.8 Flash is 66.7x cheaper for input tokens. Claude Fable 5.1 costs $10.00/M input and $50.00/M output via anthropic. Qwen3.8 Flash costs $0.15/M input and $0.47/M output via novita.

What are the context window sizes for Claude Fable 5.1 and Qwen3.8 Flash?

Claude Fable 5.1 supports 1.0M tokens and Qwen3.8 Flash 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 Qwen3.8 Flash?

Key differences include LLM Stats Score (54.8 vs 49.6), input pricing ($10.00 vs $0.15/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Fable 5.1 and Qwen3.8 Flash?

Claude Fable 5.1 is developed by Anthropic and Qwen3.8 Flash is developed by Alibaba Cloud / Qwen Team.

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