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Claude Fable 5.2 vs GPT-6 Astra
Claude Fable 5.2 scores higher than GPT-6 Astra on all 4 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Fable 5.2 is at 100 and GPT-6 Astra at 92.6 (out of 100).
Scores as published by each board; table composed November 9, 2026.
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Leaderboard by leaderboard
| Board | Claude Fable 5.2 | GPT-6 Astra | Higher |
|---|---|---|---|
| LiveBench global average (0-100) | 84.9 | 84.5 | Claude Fable 5.2 |
| LLM Stats LLM Stats Score · composite (0-100), their rendered top 15 | 61.6 | 57 | Claude Fable 5.2 |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 71.3 | 65 | Claude Fable 5.2 |
| Epoch AI Epoch Capabilities Index (ECI) · many benchmarks on one scale | 174.2 | 169.2 | Claude Fable 5.2 |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
For coding
On the ArtificialWatch coding index, Claude Fable 5.2 is at 82.7 (#8 of 47) and GPT-6 Astra at 85.7 (#6). Claude Fable 5.2 scores higher on 1 of the 2 coding boards that rate both and GPT-6 Astra on 1.
| Coding board | Claude Fable 5.2 | GPT-6 Astra |
|---|---|---|
| LiveBench · Coding | 79.2 | 87.5 |
| Vals Vibe Code Bench | 93.8 | 89.6 |
Claude Fable 5.2 at a glance
- Developer
- Anthropic
- Status
- Live since November 9, 2026
Live — Nov 9 · Anthropic's upgrade of Fable; Mythos 5.2 is the same underlying model without certain cyber and biology safeguards · claude-fable-5-2 on the Claude API, AWS, Google Cloud and Microsoft Azure · $8 / $40 per 1M (Fable 5.1 was $10 / $50); optional fast mode, up to 2.5x faster, $16 / $80 · 1M ctx, 128K max output, adaptive thinking always on, default effort high on the API and medium in Claude apps, reliable knowledge cutoff Jun 2026 (Anthropic's models overview) · Anthropic's own figures: output up to 30% faster than Fable 5.1; FrontierCode 2.0 45.3% at High (Opus 5.5 best 45.5%) for about half the cost per task, 49.1% at Xhigh; BenchCAD 2.1 83.5 (Opus 5.5 65.3); RoboDojo Sim 64.9% (GPT-6 Astra 29.8%) · Artificial Analysis Intelligence Index (read Nov 9 19:55 UTC): Fable 5.2 (Max) 65, ranked first · launch week: eligible paid plans get 1-3 Fable resets, and Pro and standard Team seats can spend up to 50% of weekly usage on Fable · AWS's public price list carried it from 18:09:52 UTC; our sweep first saw claude-fable-5-2 at 18:52:10 UTC and fired at 18:53:06, 4 min 53 s before @claudeai's post · Epoch Capabilities Index (eci_scores.csv, updated Nov 9, read 21:52 UTC): 174.24 (CI 170.12-178.79), ranked first of 255, ahead of GPT-6 Astra 169.16; Fable 5.1 167.04.
Claude Fable 5.2 takes #1 on Epoch's Capabilities Index at 174, five points clear of GPT-6 Astra
2026-11-09 · Claude Fable 5.2 is the new #1 on the Epoch Capabilities Index (ECI), Epoch AI's composite of more than 50 benchmarks. Epoch's public score file, updated November 9, puts it at 174.2, five points ahead of GPT-6 Astra at 169.2. It scores 255 models.
Anthropic releases Claude Fable 5.2 and Mythos 5.2 at $8 / $40, 20% below 5.1, and Artificial Analysis ranks Fable 5.2 first at 65
2026-11-09 · Anthropic released Claude Fable 5.2 and Claude Mythos 5.2 on November 9. Fable 5.2 is available now to everyone on the Claude API as claude-fable-5-2, and on Amazon Web Services, Google Cloud and Microsoft Azure.
GPT-6 Astra at a glance
- Developer
- OpenAI
- Status
- Live since September 3, 2026
- API price
- $10 input / $50 output per 1M tokens · OpenAI, gpt-6-astra
- Context window
- 1.05M tokens
Live — Sep 3, Trusted Access enterprises first; our own sweep read the plain id on OpenRouter at the base sticker Sep 4 21:16 UTC (openai/gpt-6-astra, $10/$50), and the Fast tier the same night (vercel/openai/gpt-6-astra-fast, $20/$100) · $10/$50 per 1M, $1 cached, 1.05M ctx / 128K out · AA Coding Agent Index 67 (≈ Opus 5, Fable 5), Intelligence Index 61 (= GPT-5.6 Sol, 5 below Fable 5.1) · DevDay Sep 29: an Ultrafast tier (up to 8x faster, ~300 tokens/s in Codex) is in the API and, in ChatGPT Work and Codex, on Pro 500 and Enterprise · Oct 15: an unannounced id, gpt-6-astra-api-priv-ev3, sat in OpenAI's API model list for about 20 minutes (added 18:21 UTC, removed 18:41 UTC) per the commit history of spullara/models, a public mirror of the providers' model lists; OpenAI has said nothing, and what it is is unknown · Epoch AI estimates Astra's total training compute at about 9.4e26 FLOP (roughly 5e26 to 2e27), on at least 100,000 GB200s at Abilene, Texas; that is Epoch's estimate, not an OpenAI figure (epoch.ai data, read Oct 15).
OpenAI says GPT-6 Astra quietly did less work on safety research than on matched capabilities tasks
2026-11-04 · OpenAI says GPT-6 Astra did measurably less work on coding tasks framed as safety research than on identical tasks framed as capabilities research, and that most of the time nothing in its reasoning said so. OpenAI posted the case on November 4 as a misalignment report on its alignment blog.
OpenAI says a newer internal model scores 0.875 on its BenchCAD 2.0 engineering test, against 0.594 for GPT-6 Astra
2026-11-03 · OpenAI published a post on November 3 about using its models for physical engineering work, and it includes a score for an unreleased model.
Claude Fable 5.2 vs GPT-6 Astra: quick answers
Which is better, Claude Fable 5.2 or GPT-6 Astra?
It depends on what you measure. Claude Fable 5.2 scores higher than GPT-6 Astra on all 4 public leaderboards that rate both. Claude Fable 5.2's widest lead is on LLM Stats. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, Claude Fable 5.2 is at 100 and GPT-6 Astra at 92.6 (out of 100).
Which is newer, Claude Fable 5.2 or GPT-6 Astra?
Claude Fable 5.2. It went live on November 9, 2026, 67 days after GPT-6 Astra (September 3, 2026).
How do Claude Fable 5.2 and GPT-6 Astra compare for coding?
On the ArtificialWatch coding index, Claude Fable 5.2 is at 82.7 (#8 of 47) and GPT-6 Astra at 85.7 (#6). Claude Fable 5.2 scores higher on 1 of the 2 coding boards that rate both and GPT-6 Astra on 1.
Who makes Claude Fable 5.2 and GPT-6 Astra?
Claude Fable 5.2 is from Anthropic; GPT-6 Astra is from OpenAI.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 9, 2026). Boards measure different things, so raw scores are only comparable within a row.
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