MODEL PROOF
GPT-5.6 Terra Pro
NOT INDEPENDENTLY RATED
No independent LMArena score is published for this model.
Base context tier shown; inspect the complete context ladder below.
- Independent LMArena score
- Not independently rated
- Context window
- 1.05M
- Maximum output
- 128K
- Input modalities
- file, image, text
- Output modalities
- text
- Published input price
- $2.00 / 1M tokens
- Published output price
- $12.00 / 1M tokens
- Pricing kind
- fixed
- Context tiers
- Tiered by context
Inspect complete billing conditions and endpoint terms below.
Price from OpenAI: the cheapest offer that is serving, at standard delivery and at the maker’s precision or better, at its standard rate.
Cheaper right now: $2.25/M at OpenAI — delivery tier (flex) It does not pass the like-for-like test, so it never sets a rank.
Every price dimension · USD per million tokens
| Input | $2.00/M |
|---|---|
| Output | $12.00/M |
| Cached input | $0.200/M |
| Cache write | $2.50/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 | $4.00/M in (2×) $18.00/M out $0.400/M cached input $5.00/M cache write |
|---|
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
5 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
| $1.00 | $6.00 | undeclared | — |
| Azureazure Endpoint terms
| $2.00 | $12.00 | undeclared | 100.00% |
| OpenAIopenai Endpoint terms
| $2.00 | $12.00 | undeclared | 99.96% |
| Azureazure/eu Endpoint terms
| $2.20 | $13.20 | undeclared | 100.00% |
| OpenAIopenai/fast Endpoint terms
| $4.00 | $24.00 | undeclared | 100.00% |
Independent scores
No independent benchmark has measured this model. Unrated is not a score of zero.
Capability
| Context window | 1M |
|---|---|
| Max output | 128K |
| Input modes | file, image, text |
| Tool use | yes |
| Reasoning | optional |
| Knowledge cutoff | 2026-02-16 |
| Open weights | no |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-10-06 |
| Quality data | unrated |
GPT-5.6 Terra Pro is the same underlying model as [GPT-5.6 Terra](https://openrouter.ai/openai/gpt-5.6-terra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. **Cost note:** pro mode spends far more...
Questions this page answers
What does GPT-5.6 Terra Pro cost?
$2.00/M in, $12.00/M out in this catalogue, as of the fetch date on this page. That is the API row, not a subscription.
Does GPT-5.6 Terra Pro have an independent quality score?
GPT-5.6 Terra Pro has no independent quality score in this catalogue. Unrated is not a score of zero.
What beats GPT-5.6 Terra Pro?
GPT-5.6 Terra Pro has no independent quality score. Unrated is not a score of zero.
Does this page use Artificial Analysis scores for GPT-5.6 Terra Pro?
No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated.
Does a missing score mean GPT-5.6 Terra Pro scored zero?
Unrated is not a score of zero.
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-5.6-terra-pro/)<a href="https://undominated.ai/models/openai__gpt-5.6-terra-pro/"><img src="https://undominated.ai/badge/openai__gpt-5.6-terra-pro.svg" alt="GPT-5.6 Terra Pro — Undominated.ai dominance verdict" height="36"></a>Direct file: https://undominated.ai/badge/openai__gpt-5.6-terra-pro.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.
