LLM Comparison
Claude Fable 5.1 vs GPT-6 Astra
Side-by-side specs, pricing & capabilities
Price vs Intelligence
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2/6 models| Organization | ||
| OpenTools Score | 98 3.3 | 95 3.2 |
| Family | Claude Fable | GPT |
| Status | Current | Current |
| Release Date | Sep 2026 | Sep 2026 |
| Context Window | 1.0M tokens | 1.1M tokens |
| Input Price | $10.00/M tokens | $10.00/M tokens |
| Output Price | $50.00/M tokens | $50.00/M tokens |
| Pricing Notes | Anthropic lists $10 per million input tokens and $50 per million output tokens. Cache reads cost $0.25 per million tokens, 5-minute cache writes cost $12.50, 1-hour cache writes cost $20, and Batch API input/output receives a 50% discount. | Standard USD per 1M tokens: $10 input, $1 cached input, $12.50 cache writes, $50 output. Above 272K input tokens, input and cache rates double and output is 1.5x for the full request. Batch/Flex are 50% of Standard; Fast mode is 2x applicable rates. |
| Capabilities | textvisionreasoningcodingtool-useagentslong-contextadaptive-thinking | textvisioncodetool-usecomputer-usebrowsinglong-contextagentic-workflows |
| Training Cutoff | 2026-06 | Apr 30, 2026 |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | claude-fable-5-1 | gpt-6-astra |
| Benchmarks | ||
| Agents' Last Exam | — | 59.3%https://openai.com/index/gpt-6-astra/ |
| ARC-AGI-3 | — | 99.9%https://openai.com/index/gpt-6-astra/ |
| Artificial Analysis Intelligence Index v4.3 | 53.4 indexartificial-analysis | 52.8 indexartificial-analysis |
| FrontierMath Tier 4 (v2) | — | 97.6%https://openai.com/index/gpt-6-astra/ |
| GPQA Diamond | 93.7%artificial-analysis | 96.1%artificial-analysis |
| GPQA Diamond | — | 96%https://openai.com/index/gpt-6-astra/ |
| SciCode | 63.1%artificial-analysis | 56.5%artificial-analysis |
| Terminal-Bench 2.1 | 91.4%artificial-analysis | 88.4%artificial-analysis |
| Terminal-Bench 4.0 | — | 57.9%https://openai.com/index/gpt-6-astra/ |
| View Claude Fable 5.1 | View GPT-6 Astra | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Claude Fable 5.1Cheapest | $10.00 | $25.00 | $35.00 | — |
| GPT-6 AstraCheapest | $10.00 | $25.00 | $35.00 | — |
Anthropic
Claude Fable 5.1
Claude Fable 5.1 is Anthropic's model for demanding reasoning and long-horizon agentic work. It supports text and image input, text output, a 1M-token context window and always-on adaptive thinking. Anthropic recommends Claude Opus 5 for most workloads and Fable 5.1 when higher-effort Opus evaluations fall short.
OpenAI
GPT-6 Astra
GPT-6 Astra is OpenAI's frontier model for end-to-end work across computer use, browsing, software engineering, cybersecurity, science, long-context tasks, and professional workflows. OpenAI describes it as its most intelligent and aligned model to date.
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