Claude Fable 5.1 vs GPT-6 Astra: Specs & Benchmark Comparison
| Characteristic | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|
| Company | Anthropic | OpenAI |
| Release Date | September 1, 2026 | September 3, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 128K | 128K |
| Input Price / 1M | $10.00 | $10.00 |
| Output Price / 1M | $50.00 | $50.00 |
| Average Score | 0.6 | 0.7 |
| Benchmarks | ||
| Terminal-Bench-Science 0.1 | 0.5 | 0.6 |
| AutomationBench | 0.3 | 0.4 |
| OSWorld 2.0 | 0.8 | 0.7 |
| Terminal-Bench 4.0 | 0.6 | 0.6 |
Visual Benchmark Comparison
Claude Fable 5.1
GPT-6 Astra
Terminal-Bench-Science 0.10.5 vs 0.6
0.5
0.6
AutomationBench0.3 vs 0.4
0.3
0.4
OSWorld 2.00.8 vs 0.7
0.8
0.7
Terminal-Bench 4.00.6 vs 0.6
0.6
0.6
Verdict
GPT-6 Astra leads in 1 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Claude Fable 5.1 — 0.6, GPT-6 Astra — 0.7.
API Cost
API cost is identical: input $10.00/1M, output $50.00/1M tokens.
Context Window
GPT-6 Astra supports a larger context: 1M vs 1M tokens.
Recency
Both models were released around the same time: 9/1/2026 and 9/3/2026.
More About These Models
Related Comparisons
Frequently Asked Questions
Which is better for coding — Claude Fable 5.1 or GPT-6 Astra?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Claude Fable 5.1 or GPT-6 Astra?
Claude Fable 5.1 is cheaper for input: $10.00 per 1M tokens vs $10.00.
Which has a larger context window — Claude Fable 5.1 or GPT-6 Astra?
GPT-6 Astra supports a larger context: 1,050,000 tokens vs 1,048,576.
The Claude Fable 5.1 and GPT-6 Astra comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Fable 5.1 or GPT-6 Astra page. See also the complete list of AI model comparisons.