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GPT-6 Astra vs Claude Opus 4.8
GPT-6 Astra scores higher than Claude Opus 4.8 on all 5 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 88.5 and Claude Opus 4.8 at 47.8 (out of 100).
Scores as published by each board; table composed September 24, 2026.
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Leaderboard by leaderboard
| Board | GPT-6 Astra | Claude Opus 4.8 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,792.2 | 1,555.2 | GPT-6 Astra |
| LiveBench global average (0-100) | 82.2 | 76.2 | GPT-6 Astra |
| SimpleBench AVG@5 % (private set) | 86.5 | 64.8 | GPT-6 Astra |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 66.6 | 60.9 | GPT-6 Astra |
| Artificial Analysis intelligence index · measured runs only | 52.7 | 41.8 | GPT-6 Astra |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
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).
GPT-6 Astra is out — Fable 5.1's sticker, trusted access first, public API within days
2026-09-03 · OpenAI shipped GPT-6 Astra today. Its own words, from the model documentation: "Our most capable model, built for the hardest end-to-end work" — complex reasoning, coding, computer use, research and document creation.
OpenAI is treating Astra as its first Critical cyber model — and slowing it down, 24 hours after the leaks said next week
2026-08-07 · Twenty-four hours ago both accounts we track said Astra was launching next week. Today OpenAI published that it is slowing the model down, and the reason outranks any launch calendar.
Claude Opus 4.8 at a glance
- Developer
- Anthropic
- Status
- Live since May 27, 2026
- API price
- $5 input / $25 output per 1M tokens · Anthropic, claude-opus-4-8
- Context window
- 1M tokens
Live.
GPT-6 Astra vs Claude Opus 4.8: quick answers
Which is better, GPT-6 Astra or Claude Opus 4.8?
It depends on what you measure. GPT-6 Astra scores higher than Claude Opus 4.8 on all 5 public leaderboards that rate both. GPT-6 Astra's widest lead is on LMArena. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6 Astra is at 88.5 and Claude Opus 4.8 at 47.8 (out of 100).
Which is newer, GPT-6 Astra or Claude Opus 4.8?
GPT-6 Astra. It went live on September 3, 2026, 99 days after Claude Opus 4.8 (May 27, 2026).
Which is cheaper, GPT-6 Astra or Claude Opus 4.8?
Claude Opus 4.8 is cheaper on both input and output. On each vendor's own API, GPT-6 Astra is $10 input / $50 output per million tokens and Claude Opus 4.8 is $5 input / $25 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 2026-09-24.
Which has the bigger context window, GPT-6 Astra or Claude Opus 4.8?
GPT-6 Astra, at 1.05M tokens against Claude Opus 4.8's 1M, as each vendor lists it.
Who makes GPT-6 Astra and Claude Opus 4.8?
GPT-6 Astra is from OpenAI; Claude Opus 4.8 is from Anthropic.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed September 24, 2026). Boards measure different things, so raw scores are only comparable within a row.
More comparisons
Watch free: Chrome push the moment a new model answers on a public API, an email about 15 minutes later. Also: the bench index · API pricing · the wire