MODEL PROOF
GPT-6 Astra
BETTER VALUE OPTION
A stored alternative has an equal-or-higher measured score and an equal-or-lower price.
Base context tier shown; inspect the complete context ladder below.
GPT-5.5 · Δ score 21.9 points · 44% lower measured price · $11.25 / 1M tokens
Claude Opus 5 is a further stored option with these losses: 1.1M → 1M context
- Independent LMArena score
- 1,443.7 ± 11.64 · 2,693 votes
- Context window
- 1.05M
- Maximum output
- 128K
- Input modalities
- file, image, text
- Output modalities
- text
- Published input price
- $10.00 / 1M tokens
- Published output price
- $50.00 / 1M tokens
- Pricing kind
- fixed
- Context tiers
- Tiered by context
Inspect complete billing conditions and endpoint terms below.
Every price dimension · USD per million tokens
| Input | $10.00/M |
|---|---|
| Output | $50.00/M |
| Cached input | $1.00/M |
| Cache write | $12.50/M |
| Cache write 1h | Unknown/M |
| Reasoning | Unknown/M |
| Web search | $0.01/call |
The headline rate does not apply to a long-context workload.
Complete context ladder · 1 tier
| More than 272,000 tokens | $20.00/M in (2×) $75.00/M out $2.00/M cached input $25.00/M cache write |
|---|
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
6 provider offers · rates, limits and conditions
Rates are USD per million tokens. Endpoint terms can differ even when the quoted price and precision match. A listed parameter is a provider declaration, not a task-success test.
| Seller | Input | Output | Precision | Uptime (1d) |
|---|---|---|---|---|
| OpenAIopenai/flex Endpoint terms
| $5.00 | $25.00 | undeclared | 99.99% |
| Azureazure Endpoint terms
| $10.00 | $50.00 | undeclared | 100.00% |
| OpenAIopenai Endpoint terms
| $10.00 | $50.00 | undeclared | 99.93% |
| Amazon Bedrockamazon-bedrock/us-west-2 Endpoint terms
| $11.00 | $55.00 | undeclared | — |
| Azureazure/us Endpoint terms
| $11.00 | $55.00 | undeclared | 100.00% |
| OpenAIopenai/fast Endpoint terms
| $20.00 | $100 | undeclared | 99.95% |
Independent scores
| LMArena Elo | 1443.7max |
|---|
LMArena Elo under CC BY 4.0. Absence of another board is not a score of zero.
Capability
| Context window | 1.1M |
|---|---|
| Max output | 128K |
| Input modes | file, image, text |
| Tool use | yes |
| Reasoning | always on |
| Open weights | Unknown |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-09-23 |
| Quality data | verified |
GPT-6 Astra is OpenAI's flagship model for demanding end-to-end work. It is suited for advanced analysis, software engineering, deep research, scientific work, and document creation, with particular strengths in long-horizon...
Questions this page answers
What does GPT-6 Astra cost?
$10.00/M in, $50.00/M out in this catalogue, as of the fetch date on this page. That is the API row, not a subscription.
Does GPT-6 Astra have an independent quality score?
GPT-6 Astra has an LMArena score in this catalogue.
What beats GPT-6 Astra?
GPT-5.5 has an equal-or-higher measured score and an equal-or-lower price.
Does this page use Artificial Analysis scores for GPT-6 Astra?
No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated.
MODEL MONUMENT
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The verdict as one SVG, for a README or a docs page. It states this model's dominance status at the balanced workload on the LMArena lens, with the date it was computed, and it is rebuilt with the catalogue — so it changes when the verdict changes, including to one you would rather it did not.
[](https://undominated.ai/models/openai__gpt-6-astra/)<a href="https://undominated.ai/models/openai__gpt-6-astra/"><img src="https://undominated.ai/badge/openai__gpt-6-astra.svg" alt="GPT-6 Astra — Undominated.ai dominance verdict" height="36"></a>Direct file: https://undominated.ai/badge/openai__gpt-6-astra.svg — a static SVG, written by scripts/build-badges.mjs on every build, so the copy you embed is never
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