Which is cheaper, Claude Fable 5.1 and Qwen3.8 27B?

Qwen3.8 27B has the lowest input price. Per 1M input tokens: Claude Fable 5.1 from $10.00 and Qwen3.8 27B from $0.40.

Which has the larger context window, Claude Fable 5.1 and Qwen3.8 27B?

Claude Fable 5.1 has the largest context window: Claude Fable 5.1 1,000,000 tokens and Qwen3.8 27B 262,144 tokens.

Which is smarter, Claude Fable 5.1 and Qwen3.8 27B?

Claude Fable 5.1 scores highest on the Artificial Analysis Intelligence Index: Claude Fable 5.1 47.0 and Qwen3.8 27B 20.1.

Can I switch between Claude Fable 5.1 and Qwen3.8 27B without changing my code?

Yes. All of them are served through FastRouter's OpenAI-compatible API, so switching is a change of the model parameter (anthropic/claude-fable-5.1, qwen/qwen3.8-27b).

Claude Fable 5.1 vs Qwen3.8 27B

Side-by-side pricing per provider, context window, benchmark scores and speed, all on one OpenAI-compatible API.

Estimate monthly cost for these models

Claude Fable 5.1 Anthropicanthropic/claude-fable-5.1

Qwen3.8 27B Alibabaqwen/qwen3.8-27b

Creator

Anthropic

Alibaba

Released

Sep 1, 2026

Aug 14, 2025

Context window

262K

Max output

128K

33K

Input / 1MLowest provider price

$10.00

$0.40

Output / 1MLowest provider price

$50.00

$3.00

Providers

IntelligenceArtificial Analysis index

47.0

20.1

Accepts

Text, Image, Files

Text, Image, Video

Produces

Text

Tool calling

Yes

Structured output

Yes

Reasoning

Yes

Claude Fable 5.1 vs Qwen3.8 27B: summary

Claude Fable 5.1 and Qwen3.8 27B are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

Claude Fable 5.1, from Anthropic, has a 1,000,000-token context window, costs $10.00/1M input and $50.00/1M output tokens and scores 47.0 on the Artificial Analysis Intelligence Index.

Qwen3.8 27B, from Alibaba, has a 262,144-token context window, costs $0.40/1M input and $3.00/1M output tokens and scores 20.1 on the Artificial Analysis Intelligence Index.

Qwen3.8 27B is the cheapest on input, 25× cheaper than the next model, Claude Fable 5.1 has the largest context window and Claude Fable 5.1 scores highest for intelligence.

Switch with one line

client = OpenAI(base_url="https://api.fastrouter.ai/api/v1", api_key="<FASTROUTER_API_KEY>") client.chat.completions.create(model="anthropic/claude-fable-5.1", messages=[...]) # or client.chat.completions.create(model="qwen/qwen3.8-27b", messages=[...])

Full API docs

Frequently asked questions

More comparisons

Benchmark scores sourced from ArtificialAnalysis