The differences that matter
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Standard API prices in USD per million tokens. Verification dates appear below; rates follow the published schedule. Conditions appear alongside the rates. Task guidance follows documented capabilities; it is not a performance ranking.
| What matters | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|
| Consider it for | Long-running agents | Reasoning & coding |
| Why it may fit | Anthropic positions this model for demanding reasoning and long-horizon agentic work. Adjustable effort lets you test the tradeoff between depth, time and token use. | Documented reasoning controls (low, medium, high, xhigh, max) let you tune effort. Check results and cost on your own tasks. |
| Tradeoff | A larger context budget does not establish better recall or answer quality. Audio/video workflows need conversion unless documented separately by the provider. | A larger context budget does not establish better recall or answer quality. Long prompts increase the rate for the whole request. Audio/video workflows need conversion unless documented separately by the provider. |
| Inputs | Text, images, PDF | Text, images, PDF |
| Context budget | 1,000,000 tokens | 1,050,000 tokens · total context; up to 922,000 tokens input |
| Maximum output | 128,000 tokens | 128,000 tokens |
| Reasoning controls | low, medium, high, xhigh, max; default high; Adaptive (always on) | low, medium, high, xhigh, max; Reasoning supported |
| Input / 1M tokens | $10 | $10 |
| Output / 1M tokens | $50 | $50 |
| Pricing conditions | Standard Claude API token rates. Caching, batch processing, tools and cloud-platform rates are separate. | Above 272,000 input tokens, the full request costs 2× input and 1.5× output. Standard text-token rates. Caching, Batch, Flex, Fast mode and tools have separate rates. |
| API access | Claude API; cloud-platform availability and prices can differ | OpenAI API |
| Native output | text | text |
| Official sources | Current model lineupModel specificationsReasoning controlsPDF support | Current model lineupModel specificationsPDF support |
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Claude Fable 5.1 ·
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GPT-6 Astra ·
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Gemini 4 Argon ·
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Task guidance follows documented capabilities. No cross-lab performance ranking. API limits and prices differ from chat subscriptions. Open a profile for the official sources and pricing conditions.