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 Pro: price, context and capabilities
Choose GPT-6 Astra Pro for 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 Pro reads more per request: 1.05M tokens against 1M.
- GPT-6 Astra Pro is the newer model (Sep 4, 2026, against June 2026).
- Only Claude Fable 5 offers batch api.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Latest release
Choose GPT-6 Astra Pro
GPT-6 Astra Pro is the newer release (Sep 4, 2026, against June 2026 for Claude Fable 5).
Monthly cost at three volumes
| Volume | Claude Fable 5 | GPT-6 Astra Pro | 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 Pro | |
|---|---|---|
| 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 4, 2026 |
| Knowledge cutoff | No data | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching |
| API model id | claude-fable-5 | gpt-6-astra-pro |
Benchmarks side by side
Leader in bold.
| Benchmark | Claude Fable 5 | GPT-6 Astra Pro |
|---|---|---|
| Intelligence Index | 49.6 | No data |
| Terminal-Bench Hard | 62.9% | No data |
| SciCode | 61% | No data |
| GPQA Diamond | 92.6% | No data |
| Humanity's Last Exam | 55.5% | No data |
| IFBench (instruction following) | 63.5% | No data |
| τ²-Bench (agentic tool use) | 98.5% | No data |
| Long-context reasoning (AA-LCR) | 82.3% | No data |
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 Pro?
Choose GPT-6 Astra Pro for 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 Pro?
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 Pro?
GPT-6 Astra Pro reads more per request: 1.05M tokens against 1M.
What is the difference between Claude Fable 5 and GPT-6 Astra Pro?
Claude Fable 5 is made by Anthropic and GPT-6 Astra Pro by OpenAI. Both cost the same at the headline price ($20.00 / 1M tokens). GPT-6 Astra Pro reads more per request: 1.05M tokens against 1M. GPT-6 Astra Pro is the newer model (Sep 4, 2026, against June 2026). Only Claude Fable 5 offers batch api.
How much do Claude Fable 5 and GPT-6 Astra Pro cost per month?
At 20 million input and 5 million output tokens a month, Claude Fable 5 costs $450.00 and GPT-6 Astra Pro costs $450.00, at standard rates.
Which is newer, Claude Fable 5 or GPT-6 Astra Pro?
GPT-6 Astra Pro was released on Sep 4, 2026 and Claude Fable 5 on June 2026.