Claude Fable 5.1 vs GPT-6 Astra
At a Glance
| Compare | Claude Fable 5.1Anthropic |  GPT-6 AstraOpenAI |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v4.4 | #2 of 5799.0 score · 3/3 sources · complete | #6 of 5784.6 score · 3/3 sources · complete |
| CostLower is better · Published-token output estimate | #27 of 27$0.824 per LiveBench case | #26 of 27$0.520 per LiveBench case |
| EfficiencyHigher is better · MM Efficiency v1.9 | #14 of 2749.5 score · 3/3 sources · complete | #18 of 2746.1 score · 3/3 sources · complete |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $10.00Anthropic ↗ · Sep 3, 2026 | $10.00Openai ↗ · Sep 4, 2026 |
| Output priceFrom · USD / 1M tokens | $50.00Anthropic ↗ · Sep 3, 2026 | $50.00Openai ↗ · Sep 4, 2026 |
| Context windowMaximum documented tokens | 1,000K | 1,050K |
| Model facts checked | Sep 2, 2026View model evidence → | Sep 4, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
| Benchmark | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|
| ARC-AGI-1verified-v1-302d8267c052 · 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-bca68e12cc9a · verified_score · leader | 90.0095% of row best · percent · Claude Fable 5.1 (XHigh) | 95.00100% of row best · percent · GPT-6 Astra (Max) |
| LMArena Document Arenadocument-2026-09-13-a64ca3b12b6e · arena_rating · leader | 1,512.58100% of row best · rating · claude-fable-5.1-max; 95% CI [1497.40364732, 1527.76498981]; votes 1403; rank 2 | 1,467.5297% of row best · rating · gpt-6-astra-max; 95% CI [1453.25995337, 1481.78626802]; votes 1621; rank 16 |
| LMArena Search Arenasearch-2026-10-13-a64ca3b12b6e · arena_rating · statistical tie | 1,245.85100% of row best · rating · claude-fable-5.1-high; 95% CI [1238.79268797, 1252.89817971]; votes 12782; rank 5 | 1,233.6299% of row best · rating · gpt-6-astra-max; 95% CI [1225.77363708, 1241.45798456]; votes 18483; rank 7 |
| LMArena Vision Arenavision-2026-10-09-a64ca3b12b6e · arena_rating · leader | 1,318.24100% of row best · rating · claude-fable-5.1-max; 95% CI [1308.61778049, 1327.86146111]; votes 4648; rank 4 | 1,281.3597% of row best · rating · gpt-6-astra-max; 95% CI [1270.63592513, 1292.07239183]; votes 3590; rank 36 |
| LiveBench2026-06-25-90f8d44da965 · overall · leader | 86.82100% of row best · percent · claude-fable-5-1-max-effort · 16,470 output tokens / case | 86.47100% of row best · percent · gpt-6-astra-max · 10,407 output tokens / case |
| ToneBench2026-10-17-10-task-e9c76358afb2 · overall_score · unverified | 84.53100% of row best · points · Claude Fable 5.1 (max effort) · 68,653 output tokens / case | 82.3297% of row best · points · GPT-6 Astra (max) · 20,449 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above · 1 tie | 3 benchmark winsOverall lead | 2 benchmark wins |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Quality Versus Estimated Output Cost
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), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, computer-use, generation, reasoning, research, tools |
Claude Fable 5.1 Capabilities
GPT-6 Astra Capabilities
Related Comparisons
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Claude Fable 5.1Anthropic | vs | Claude Mythos 5.1Anthropic | family variantsimage, text |
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Claude Fable 5.1Anthropic | vs |  DeepSeek-V4-Flash-Vision-ExpDeepSeek | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs |  Qwen3.7 MaxQwen | 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 1,000,000 tokens and GPT-6 Astra supports 1,050,000 tokens.
Which performs better in benchmarks, Claude Fable 5.1 or GPT-6 Astra?+
Claude Fable 5.1 leads the current overall benchmark count. The result uses 6 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.
Can Claude Fable 5.1 or GPT-6 Astra be self-hosted?+
Both models have the same sourced 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?+
Both models have the same sourced maximum output: 128,000 tokens each.
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 2, so GPT-6 Astra has broader tracked availability.
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.