Claude Fable 5.1 vs GPT-6 Astra
API pricing, context window and capabilities for Claude Fable 5.1 and GPT-6 Astra, 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. GPT-6 Astra wins on context window.
Price
Tied
Terminal-Bench
Claude Fable 5.1
Intelligence
Claude Fable 5.1
Context window
GPT-6 Astra
Key takeaways
who wins on what, from the published numbersClaude Fable 5.1 wins
- More serving providers (7 vs 5)
GPT-6 Astra wins
- Larger context window (1M vs 1.1M)
Cheaper overall
Tied
Larger context
GPT-6 Astra
1.1M
More providers
Claude Fable 5.1
7 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 | GPT-6 Astra | |
|---|---|---|
| Input $/1M | $10.00via Anthropic | $10.00via OpenAI |
| Output $/1M | $50.00via Anthropic | $50.00via OpenAI |
| Context window | 1M | 1.1M best |
| Max output | 128K | 128K |
| Serving providers | 7 best | 5 |
| Date | Released Sep 1, 2026 | Released Sep 4, 2026 |
Benchmarks
Benchmark scores, side by side| Claude Fable 5.1 | GPT-6 Astra | |
|---|---|---|
| Intelligence | 53.4 best | 52.7 |
| Terminal-Bench | 91% best | 88% |
| GPQA Diamond | 94% | 96% best |
| Output speed | 71 t/s best | 44 t/s |
| Latency (TTFT) | 261.97s best | 288.16s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Fable 5.1
via Amazon Bedrock
$100
GPT-6 Astra
via Vercel
$100
Capabilities
feature support, side by side| Feature | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Fable 5.1 or GPT-6 Astra?
Claude Fable 5.1 and GPT-6 Astra have the same cheapest published input and output rates.
What is the context window difference between Claude Fable 5.1 and GPT-6 Astra?
Claude Fable 5.1 has a 1M-token context window and GPT-6 Astra has 1.1M tokens, so GPT-6 Astra can take a larger prompt.
How do Claude Fable 5.1 and GPT-6 Astra 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 15, 2026
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