Claude Fable 5.1 vs Claude Opus 5
API pricing, context window and capabilities for Claude Fable 5.1 and Claude Opus 5, 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 and on intelligence. Claude Opus 5 wins on price.
Price
Claude Opus 5
Terminal-Bench
Claude Fable 5.1
Intelligence
Claude Fable 5.1
Context window
Tied
Key takeaways
who wins on what, from the published numbersClaude Fable 5.1 wins
No clear edge on the tracked metrics.
Claude Opus 5 wins
- Cheaper input ($10.00 vs $5.00 /1M)
- Cheaper output ($50.00 vs $25.00 /1M)
- More serving providers (7 vs 9)
Cheaper overall
Claude Opus 5
$5.00 + $25.00 /1M
Larger context
Tied
More providers
Claude Opus 5
9 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| Claude Fable 5.1 | Claude Opus 5 | |
|---|---|---|
| Input $/1M | $10.00via Anthropic | $5.00via Anthropic best |
| Output $/1M | $50.00via Anthropic | $25.00via Anthropic best |
| Context window | 1M | 1M |
| Max output | 128K | 128K |
| Serving providers | 7 | 9 best |
| Date | Released Sep 1, 2026 | Released Jul 24, 2026 |
Benchmarks
Benchmark scores, side by side| Claude Fable 5.1 | Claude Opus 5 | |
|---|---|---|
| Intelligence | 53.4 best | 50.8 |
| Terminal-Bench | 91% best | 89% |
| GPQA Diamond | 94% best | 93% |
| Output speed | 71 t/s best | 56 t/s |
| Latency (TTFT) | 249.68s | 107.27s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Fable 5.1
via Amazon Bedrock
$100
Claude Opus 5
via OpenRouter
$50
Capabilities
feature support, side by side| Feature | Claude Fable 5.1 | Claude Opus 5 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Fable 5.1 or Claude Opus 5?
Claude Opus 5 is cheaper for input ($10.00 vs $5.00 per 1M tokens) from Anthropic. Claude Opus 5 is cheaper for output ($50.00 vs $25.00 per 1M tokens) from Anthropic.
What is the context window difference between Claude Fable 5.1 and Claude Opus 5?
Both Claude Fable 5.1 and Claude Opus 5 have about a 1M-token context window.
How do Claude Fable 5.1 and Claude Opus 5 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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