High-volume, cost-sensitive work
Either one
Both cost $20.00 per million tokens on a typical mix of three input tokens for every output token.
Claude Fable 5 vs GPT-6 Astra: price, context and capabilities
Choose GPT-6 Astra for the hardest reasoning tasks and the latest release; on the other points the two are level or the data is missing.
In short
- Both cost the same at the headline price ($20.00 / 1M tokens).
- GPT-6 Astra reads more per request: 1.05M tokens against 1M.
- GPT-6 Astra is the newer model (Sep 3, 2026, against June 2026).
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Hardest reasoning tasks
Choose GPT-6 Astra
GPT-6 Astra scores 52.7 on the Artificial Analysis Intelligence Index, against 49.6 for Claude Fable 5.
Reasoning over long documents
Either one
They are practically level on Long-context reasoning (AA-LCR) (82.3% and 80.7%).
Latest release
Choose GPT-6 Astra
GPT-6 Astra is the newer release (Sep 3, 2026, against June 2026 for Claude Fable 5).
Monthly cost at three volumes
| Volume | Claude Fable 5 | GPT-6 Astra | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $22.50 | $22.50 | = |
| Production: 20M input, 5M output tokens | $450.00 | $450.00 | = |
| Scale: 500M input, 100M output tokens | $10,000 | $10,000 | = |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| Claude Fable 5 | GPT-6 Astra | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Category | Language models | Language models |
| Status | Legacy | Generally available |
| Headline price | $20.00 / 1M tokens | $20.00 / 1M tokens |
| Input | $10.00 / 1M tokens | $10.00 / 1M tokens |
| Output | $50.00 / 1M tokens | $50.00 / 1M tokens |
| Cached input | $1.00 / 1M tokens | $1.00 / 1M tokens |
| Context window | 1M | 1.05M |
| Max output | 128k | 128k |
| Released | June 2026 | Sep 3, 2026 |
| Knowledge cutoff | No data | April 2026 |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API |
| API model id | claude-fable-5 | gpt-6-astra |
Benchmarks side by side
Leader in bold.
| Benchmark | Claude Fable 5 | GPT-6 Astra |
|---|---|---|
| Intelligence Index | 49.6 | 52.7 |
| SciCode | 61% | 56.5% |
| GPQA Diamond | 92.6% | 96.1% |
| Humanity's Last Exam | 55.5% | 54.7% |
| Long-context reasoning (AA-LCR) | 82.3% | 80.7% |
| Terminal-Bench Hard | 62.9% | No data |
| IFBench (instruction following) | 63.5% | No data |
| τ²-Bench (agentic tool use) | 98.5% | No data |
| MMMU-Pro (visual reasoning) | No data | 86.9% |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose Claude Fable 5 or GPT-6 Astra?
Choose GPT-6 Astra for the hardest reasoning tasks and the latest release; on the other points the two are level or the data is missing.
Which is cheaper, Claude Fable 5 or GPT-6 Astra?
Both cost the same at the headline price ($20.00 / 1M tokens).
Which has the larger context window, Claude Fable 5 or GPT-6 Astra?
GPT-6 Astra reads more per request: 1.05M tokens against 1M.
What is the difference between Claude Fable 5 and GPT-6 Astra?
Claude Fable 5 is made by Anthropic and GPT-6 Astra by OpenAI. Both cost the same at the headline price ($20.00 / 1M tokens). GPT-6 Astra reads more per request: 1.05M tokens against 1M. GPT-6 Astra is the newer model (Sep 3, 2026, against June 2026).
How much do Claude Fable 5 and GPT-6 Astra cost per month?
At 20 million input and 5 million output tokens a month, Claude Fable 5 costs $450.00 and GPT-6 Astra costs $450.00, at standard rates.
Which is newer, Claude Fable 5 or GPT-6 Astra?
GPT-6 Astra was released on Sep 3, 2026 and Claude Fable 5 on June 2026.