MODEL PROOF
GPT-6 Astra
BETTER + CHEAPER OPTION
A stored alternative scores higher and costs less under this workload.
GPT-5.5 · 21.9 points higher independent score · 44% lower measured price · $11.25 / 1M tokens
Claude Opus 5 is a further stored option with these losses: 1.1M → 1.0M 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
MODEL MONUMENT
Save or share this proof
OpenAI: GPT-6 Astra. Balanced workload. Better and cheaper option available. Evidence as of 19 Sept 2026.
$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. GPT-5.5 is both better and cheaper.
Every price dimension
| Input | $10.00/M |
|---|---|
| Output | $50.00/M |
| Cached input | $1.00/M |
| Cache write | $12.50/M |
| Web search | $0.01/call |
The headline rate does not apply to a long-context workload.
| Past 272,000 tokens | $20.00/M in (2×) $75.00/M out |
|---|
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
| Seller | Input | Output | Precision | Uptime (1d) |
|---|---|---|---|---|
| OpenAI | $5.00 | $25.00 | undeclared | 100.00% |
| Azure | $10.00 | $50.00 | undeclared | 99.96% |
| OpenAI | $10.00 | $50.00 | undeclared | 100.00% |
| Azure | $11.00 | $55.00 | undeclared | 100.00% |
| OpenAI | $20.00 | $100 | undeclared | 100.00% |
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 |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-09-19 |
| 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 is both better and cheaper.
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.
Check whether this is still the one to buy Cheaper alternatives
Badge
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
older than the last deploy.
