Is GPT-6 Astra a good deal?
Whether anything in this catalogue beats GPT-6 Astra on both quality and price, and what you give up if it does. A computation on the current catalogue, not an opinion.
6 undominated of 137 · Sep 19, 2026
As of Sep 19, 2026, GPT-6 Astra is dominated for Balanced on LMArena. GPT-5.5 scores 21.9 higher and costs 44% less, with a covering envelope. 6 of 137 rated, priced standard models are undominated.
GPT-5.5 is both better and cheaper than GPT-6 Astra: 21.9 points higher on LMArena and 44% less per million tokens, $8.75 cheaper at this mix.
GPT-6 Astra takes file, image, text, returns up to 128,000 tokens from a 1,050,000-token context, and is listed by 5 sellers.
Compared against 137 rated, priced models on this lens: 4 models dominate it and give up nothing, 5 more dominate it but give something up. GPT-6 Astra scores 1443.7 at $20.00 per million tokens for this mix.
Envelope-safe replacements
Each row scores at least as high, costs no more, and covers this model’s context, output, modalities, tools, and reasoning. A cheaper narrower model is not listed here.
| Model | LMArena | Effective $/M | You save |
|---|---|---|---|
| GPT-5.5 | 1465.6 +21.9 | $11.25/M | 44% |
| GPT-5.6 Sol | 1455.1 +11.4 | $4.00/M | 80% |
| GPT-5.4 | 1452.6 +8.9 | $5.63/M | 72% |
| GPT-5.6 Terra | 1446.2 +2.5 | $4.50/M | 78% |
Higher score, lower price, named losses
Not a drop-in. The loss is why these are not a recommendation.
| Model | LMArena | Effective $/M | You give up |
|---|---|---|---|
| Claude Fable 5.1 | 1507.6 | $20.00/M | context |
| Claude Opus 5 | 1504.9 | $10.00/M | context |
| Claude Opus 4.6 | 1503.0 | $10.00/M | context |
| Gemini 3.8 Flash | 1494.7 | $1.50/M | context, max output |
| Claude Fable 5 | 1492.6 | $20.00/M | context |
This page does not mail you. The URL is the watch: same model, same mix, current catalogue.
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