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Head-to-head comparison

Claude Fable 5.1 vs Qwen3.8 27B

Claude Fable 5.1 (Anthropic) and Qwen3.8 27B (Qwen) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 3 September 2026

As of 3 September 2026, Claude Fable 5.1 holds the stronger ModelCap Index position (#2 vs #26); Qwen3.8 27B is 19.6× cheaper per output token ($2.55/1M vs $50.00/1M); and Qwen3.8 27B ships open weights.

Which should you choose?

Choose Claude Fable 5.1 if…

  • you want the stronger overall ModelCap Index position — #2 against #26 (84.1 vs 63.9 points).
  • AA Intelligence Index is your yardstick — 65.7 against 52.0.
  • AA Terminal-Bench 2.1 is your yardstick — 91.4% against 79.8%.
  • AA Humanity's Last Exam is your yardstick — 59.1% against 33.9%.
  • you want the more recently listed model — Claude Fable 5.1 was listed 1 September 2026, Qwen3.8 27B 14 August 2026.

Choose Qwen3.8 27B if…

  • API cost matters — $2.55/1M output tokens against $50.00/1M, about 19.6× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.425/1M against $10.00/1M.
  • you want to self-host: Qwen3.8 27B ships open weights while Claude Fable 5.1 is api only.
  • you want provider choice — 12 listed API providers against 4.

Claude Fable 5.1 vs Qwen3.8 27B: specs, pricing and context

Specification comparison of Claude Fable 5.1 and Qwen3.8 27B
FieldClaude Fable 5.1AnthropicQwen3.8 27BQwen
ModelCap Index position#2#26
Index score84.163.9
EvidenceMeasuredMeasured
Input price / 1M tokens$10.00$0.425
Output price / 1M tokens$50.00$2.55
Context window1M tokens1M tokens
Max output tokens128K131K
API providers listed412
Weight accessAPI onlyOpen weights
Input modalitiesText, Image, FileText, Image, Video
First listed1 September 202614 August 2026
PublisherAnthropicQwen

Evidence: 2 public benchmark observations across 2 boards · 4 public benchmark observations across 4 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Claude Fable 5.1 vs Qwen3.8 27B

Public benchmark boards where Claude Fable 5.1 or Qwen3.8 27B has a published result
BoardClaude Fable 5.1Qwen3.8 27BLeads
Arena codingArena (LMArena)—14931479–1507Only one result
ARC-AGI-2ARC Prize Foundation90.0%Max—Only one result
AA Intelligence IndexArtificial Analysis65.7intelligence-index52.0intelligence-indexClaude Fable 5.1
AA Terminal-Bench 2.1Artificial Analysis91.4%terminal-bench-2.179.8%terminal-bench-2.1Claude Fable 5.1
AA Humanity's Last ExamArtificial Analysis59.1%humanitys-last-exam33.9%humanitys-last-examClaude Fable 5.1
WildClawBench OpenClawWildClawBench—48.0Only one result

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

Claude Fable 5.1 vs Qwen3.8 27B: common questions

Is Claude Fable 5.1 better than Qwen3.8 27B?

Claude Fable 5.1 ranks higher on the ModelCap Index as of 3 September 2026: #2 against #26. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.

Is Claude Fable 5.1 cheaper than Qwen3.8 27B?

Qwen3.8 27B is cheaper on output tokens: $2.55/1M against $50.00/1M. Input tokens are $10.00/1M for Claude Fable 5.1 and $0.425/1M for Qwen3.8 27B. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, Claude Fable 5.1 or Qwen3.8 27B?

Both publish a 1M-token context window.

Which is better for coding, Claude Fable 5.1 or Qwen3.8 27B?

AA Terminal-Bench 2.1: Claude Fable 5.1 91.4%, Qwen3.8 27B 79.8% — Claude Fable 5.1 leads.

Are Claude Fable 5.1 and Qwen3.8 27B open-weight models?

Claude Fable 5.1: API only. Qwen3.8 27B: Open weights. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run Claude Fable 5.1 and Qwen3.8 27B?

ModelCap currently lists 4 API providers for Claude Fable 5.1 and 12 for Qwen3.8 27B, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Claude Fable 5.1 vs Qwen3.8 27B comparison?

Every figure comes from the sealed ModelCap dataset published 3 September 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

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