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GPT-6 Astra vs Claude Fable 5
GPT-6 Astra scores higher than Claude Fable 5 on all 3 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6 Astra is at 92.6 and Claude Fable 5 at 60.4 (out of 100). On each maker's API, GPT-6 Astra costs $10 / $50 per 1M tokens (input / output) and Claude Fable 5 $10 / $50.
Scores as published by each board; table composed November 8, 2026.
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Leaderboard by leaderboard
| Board | GPT-6 Astra | Claude Fable 5 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,769.8 | 1,625 | GPT-6 Astra |
| SimpleBench AVG@5 % (private set) | 86.5 | 81.9 | GPT-6 Astra |
| LLM Stats LLM Stats Score · composite (0-100), their rendered top 15 | 57.3 | 52.8 | GPT-6 Astra |
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, GPT-6 Astra is at 76 (#10 of 45) and Claude Fable 5 at 88.1 (#5). Claude Fable 5 scores higher on both coding boards that rate them.
| Coding board | GPT-6 Astra | Claude Fable 5 |
|---|---|---|
| LMArena · Coding | 1,494.4 | 1,518.7 |
| Vals Vibe Code Bench | 89.6 | 90.4 |
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 at a glance
- Developer
- Anthropic
- Status
- Live since July 1, 2026
- API price
- $10 input / $50 output per 1M tokens · Anthropic, claude-fable-5
- Context window
- 1M tokens
Returned Jul 1.
GPT-6 Astra vs Claude Fable 5: quick answers
Which is better, GPT-6 Astra or Claude Fable 5?
It depends on what you measure. GPT-6 Astra scores higher than Claude Fable 5 on all 3 public leaderboards that rate both. GPT-6 Astra'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, GPT-6 Astra is at 92.6 and Claude Fable 5 at 60.4 (out of 100).
Which is newer, GPT-6 Astra or Claude Fable 5?
GPT-6 Astra. It went live on September 3, 2026, 64 days after Claude Fable 5 (July 1, 2026).
Which is cheaper, GPT-6 Astra or Claude Fable 5?
They cost the same per token. On each vendor's own API, GPT-6 Astra is $10 input / $50 output per million tokens and Claude Fable 5 is $10 input / $50 output per million tokens. GPT-6 Astra's rate rises for prompts over 272K tokens. Prices as published in the models.dev catalog, as of 2026-11-08.
Which has the bigger context window, GPT-6 Astra or Claude Fable 5?
GPT-6 Astra, at 1.05M tokens against Claude Fable 5's 1M, as each vendor lists it.
How do GPT-6 Astra and Claude Fable 5 compare for coding?
On the ArtificialWatch coding index, GPT-6 Astra is at 76 (#10 of 45) and Claude Fable 5 at 88.1 (#5). Claude Fable 5 scores higher on both coding boards that rate them.
Who makes GPT-6 Astra and Claude Fable 5?
GPT-6 Astra is from OpenAI; Claude Fable 5 is from Anthropic.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed November 8, 2026). Boards measure different things, so raw scores are only comparable within a row.
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