Claude Fable 5.1 vs Qwen3.8 27B
API pricing, context window and capabilities for Claude Fable 5.1 and Qwen3.8 27B, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude Fable 5.1 wins on Terminal-Bench, on intelligence and on context window. Qwen3.8 27B wins on price.
Price
Qwen3.8 27B
Terminal-Bench
Claude Fable 5.1
Intelligence
Claude Fable 5.1
Context window
Claude Fable 5.1
Key takeaways
who wins on what, from the published numbersClaude Fable 5.1 wins
- Larger context window (1M vs 262K)
- Higher max output (128K vs 33K)
- Has web search
Qwen3.8 27B wins
- Cheaper input ($10.00 vs $0.04 /1M)
- Cheaper output ($50.00 vs $1.49 /1M)
Cheaper overall
Qwen3.8 27B
$0.04 + $1.49 /1M
Larger context
Claude Fable 5.1
1M
More providers
Tied
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower. An OpenRouter routed quote is the price of whichever upstream provider OpenRouter prefers today, so it moves day to day.
| Claude Fable 5.1 | Qwen3.8 27B | |
|---|---|---|
| Input $/1M | $10.00via Anthropic | $0.04OpenRouter routed quote best |
| Output $/1M | $50.00via Anthropic | $1.49via Cerebras best |
| Context window | 1M best | 262K |
| Max output | 128K best | 33K |
| Serving providers | 7 | 7 |
| Date | Released Sep 1, 2026 | Released Aug 14, 2026 |
Benchmarks
Benchmark scores, side by side| Claude Fable 5.1 | Qwen3.8 27B | |
|---|---|---|
| Intelligence | 53.4 best | 33.7 |
| Terminal-Bench | 91% best | 80% |
| GPQA Diamond | 94% best | 91% |
| Output speed | 71 t/s best | 45 t/s |
| Latency (TTFT) | 249.68s | 3.83s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Fable 5.1
via Amazon Bedrock
$100
Qwen3.8 27B
via OpenRouter
$2.50
Capabilities
feature support, side by side| Feature | Claude Fable 5.1 | Qwen3.8 27B |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | — |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Fable 5.1 or Qwen3.8 27B?
Qwen3.8 27B is cheaper for input ($10.00 vs $0.04 per 1M tokens) as an OpenRouter routed quote. Qwen3.8 27B is cheaper for output ($50.00 vs $1.49 per 1M tokens) from Cerebras.
What is the context window difference between Claude Fable 5.1 and Qwen3.8 27B?
Claude Fable 5.1 has a 1M-token context window and Qwen3.8 27B has 262K tokens, so Claude Fable 5.1 can take a larger prompt.
How do Claude Fable 5.1 and Qwen3.8 27B compare on benchmarks?
On the tracked benchmarks, Claude Fable 5.1 leads on Terminal-Bench, and Claude Fable 5.1 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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