Claude Fable 5.1 vs GPT-6 Astra
Why this pair: Current OpenAI and Anthropic frontier models
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|
| ARC-AGI-1verified-v1-2aa739d957fc · verified_score · leader | 97.5099% of row best · percent · Claude Fable 5.1 (Max) | 98.50100% of row best · percent · GPT-6 Astra (XHigh) |
| ARC-AGI-2verified-v2-b5cb5ec6e8c7 · verified_score · leader | 90.0095% of row best · percent · Claude Fable 5.1 (XHigh) | 95.00100% of row best · percent · GPT-6 Astra (Max) |
| Overall ResultCounted from the protocol-matched rows above | 0 benchmark wins | 2 benchmark winsOverall lead |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Technical Differences
Side-by-Side Facts
| Field | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Family | Claude 5 1 | Gpt 6 |
| Model | Claude Fable 5.1 | GPT-6 Astra |
| Version | Claude Fable 5.1 | GPT-6 Astra |
| Lifecycle | active | active |
| Released | 2026-09-01 | 2026-09-03 |
| Knowledge cutoff | 2026-06-01 | 2026-04-30 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,000K | 1,050K |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Anthropic (Standard) | Openai (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, computer-use, generation, reasoning, research, tools |
15 comparable fields · 9 material differences · Editorially curated pair passes the primary-source comparison gate
Claude Fable 5.1 Capabilities
GPT-6 Astra Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
Claude Fable 5Anthropic | vs | Claude Fable 5.1Anthropic | family variantsimage, text |
Claude Fable 5.1Anthropic | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext |
Claude Fable 5.1Anthropic | vs |  DeepSeek-V4-ProDeepSeek | cross-developer peerstext |
Claude Fable 5.1Anthropic | vs | Grok 4.6xAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | Claude Fable 5.1Anthropic | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Claude Fable 5.1Anthropic | vs |  Hy4 previewTencent | cross-developer peerstext |
Claude Fable 5.1Anthropic | vs | Seed 2.1 ProByteDance Seed | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  Mistral Large 3Mistral AI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Fable 5.1 vs GPT-6 Astra FAQs
Is Claude Fable 5.1 or GPT-6 Astra better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Fable 5.1 and GPT-6 Astra, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Fable 5.1 or GPT-6 Astra?+
Claude Fable 5.1 is $10.00 and GPT-6 Astra is $10.00 per million tokens, so they are tied on this metric. Claude Fable 5.1 is $50.00 and GPT-6 Astra is $50.00 per million tokens, so they are tied on this metric.
Which has a larger context window, Claude Fable 5.1 or GPT-6 Astra?+
GPT-6 Astra has the larger sourced context window. Claude Fable 5.1 supports 1,000K and GPT-6 Astra supports 1,050K.
Which performs better in benchmarks, Claude Fable 5.1 or GPT-6 Astra?+
There is no overall benchmark winner: An overall winner requires at least two decisive benchmarks from at least two original publishers.
Can Claude Fable 5.1 or GPT-6 Astra be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Fable 5.1 is not marked open weight; GPT-6 Astra is not marked open weight.
Can Claude Fable 5.1 and GPT-6 Astra understand images?+
Claude Fable 5.1 is documented with image input; GPT-6 Astra is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Fable 5.1 or GPT-6 Astra?+
Neither has a larger sourced maximum output. Claude Fable 5.1 is 128K and GPT-6 Astra is 128K.
Do Claude Fable 5.1 and GPT-6 Astra support reasoning and tool use?+
Claude Fable 5.1: reasoning, tool calling, and image input. GPT-6 Astra: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Fable 5.1 or GPT-6 Astra?+
Claude Fable 5.1 has 1 sourced provider route; GPT-6 Astra has 1, a tie.
Which offers better value, Claude Fable 5.1 or GPT-6 Astra?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.