GPT-5.6 Terra
✓ VERIFIED BY OPENAIOpenAI · Proprietary · Released Jul 9, 2026 · openai/gpt-5.6-terra
Best $2.00 in / $12.00 out via OpenAI
1.05M contextVisionToolsReasoningStructured outputPrompt caching
Available from 9 providersUSD / MTOK · PRICES 23 MINUTES AGO · SPEED 2 DAYS AGO
EST. MONTHLY COSTclick a row for detail · click headers to sort
| PROVIDER | INPUT | OUTPUT | CACHE | CONTEXT | QUANT | TTFT | TPS | UPTIME |
|---|---|---|---|---|---|---|---|---|
 CheaperInferenceDIRECTMARKETPLACE | $0.80 | $4.80 | — | — | — | — | — | — |
 OpenAIFLEX1ST PARTY | $1.00 | $6.00 | $0.10 | 1.05M | — | 1.8s | 71 tok/s | 100.0% |
| CheaperInferenceDIRECTMARKETPLACE | $1.50 | $9.00 | — | — | — | — | — | — |
| OpenAI1ST PARTY | $2.00 | $12.00 | $0.20 | 1.05M | — | — | — | 100.0% |
 Azure | $2.00 | $12.00 | $0.20 | 1.05M | — | ✕ | ✕ | 100.0% |
 Amazon Bedrock | $2.20 | $13.20 | $0.22 | 1.05M | — | ✕ | ✕ | — |
| Azure | $2.20 | $13.20 | $0.22 | 1.05M | — | — | — | 100.0% |
| Azure | $2.20 | $13.20 | $0.22 | 1.05M | — | — | — | 100.0% |
| OpenAIPRIORITY1ST PARTY | $4.00 | $24.00 | $0.40 | 1.05M | — | — | — | 100.0% |
TTFT/TPS: median (P50) over trailing 504h · chat10k profile (~10K in / 200 out) · measured via OpenRouter routing · ✕ = probed, endpoint returned no measurable stream · methodology v1.1 · measured 2 days ago
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Quality benchmarksCURATED AUG 24, 2026
GPQA Diamond92.9%SELF-REPORTEDAggregator-listed; not in OpenAI's launch materialssource ↗ 2026-08-24
Third-party reported results, hand-curated with sources — not measured by ModelIndex. Our own measured serving data (TTFT/TPS/SMOKE) is in the providers table above.
Pricing variants · USD / MTok in / out
STANDARD
$2.00 / $12.00
per MTok in / out
BATCH
$1.00 / $6.00
async batch
CACHE READ $0.20CACHE WRITE $2.50WEB SEARCH $0.01 / search
Recent changesRSS ↗
Sep 23, 2026endpoint added · cheaperinference7 → 9
About
GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic...
Specifications
Context window1,050,000
Max output128,000
Modalities infile, image, text
Modalities outtext
LicenseProprietary
ReleasedJul 9, 2026
Knowledge cutoff2026-02-16
TokenizerGPT
Related
Embed badge
[](https://modelindex.ai/models/openai/gpt-5.6-terra)Sources
openai ↗23 minutes ago
OFFICIAL PRICINGOpenRouter API23 minutes ago
AGGREGATORLiteLLM dataset23 minutes ago
AGGREGATORModelIndex benchmarks3 days ago
MEASURED✓ Verified against OpenAI’s own source.
Verified 23 minutes ago · list prices, not negotiated rates.