Pricingby GlyphGPT-5.6 Terra Pro is the same underlying model as GPT-5.6 Terra, served with reasoning.mode set to pro for higher-quality responses on complex tasks.
Ways to buy 5
| Way to buy | Input | Output | In / out per 1M | Cached | Vs list |
|---|---|---|---|---|---|
flex, cheapest · cached $0.1 | $1 | $6 | $1 / $6-50% vs list | $0.1 | -50% vs list |
The lab's own API · cached $0.2 | $2 | $12 | $2 / $12List price | $0.2 | List price |
Default region · cached $0.2 | $2 | $12 | $2 / $12Same as list | $0.2 | Same as list |
eu · cached $0.22 | $2.2 | $13.2 | $2.2 / $13.2+10% vs list | $0.22 | +10% vs list |
fast · cached $0.4 | $4 | $24 | $4 / $24+100% vs list | $0.4 | +100% vs list |
USD per 1M tokens; batch $1 in, $6 out on the lab's API. Regions are separate routes.
Through a gateway
Your own numbers100M input and 20M output tokens a month: $440.00 direct.
Kong AI Gateway$440.00+0%
LiteLLM$440.00+0%
OpenRouter$464.20+5.5%
Cloudflare AI GatewayNot offeredNot offered
Eden AINot offeredNot offered
HeliconeNot offeredNot offered
Martian GatewayNot offeredNot offered
Neon AI GatewayNot offeredNot offered
RequestyNot offeredNot offered
Vercel AI GatewayNot offeredNot offered
A dash: not on that gateway's own model list. No published token fee: Portkey, TrueFoundry AI Gateway.
Related models
| In / out per 1M | Cheapest route | |||||||
|---|---|---|---|---|---|---|---|---|
OpenAI · 1.05MCheapest: $1 on OpenAI (flex) | $1 | $5 | $1 / $5 | $2 | 1.05M | $1 on OpenAI (flex) | · | GPT-6.1 Terra is the mid-tier model in OpenAI's GPT-6.1 series, priced below GPT-6.1 Sol. |
OpenAI · 1.05MCheapest: $1 on OpenAI (flex) | $1 | $5 | $1 / $5 | $2 | 1.05M | $1 on OpenAI (flex) | · | GPT-6.1 Terra Pro is the same underlying model as GPT-6.1 Terra, served with reasoning.mode set to pro for higher-quality responses on complex tasks. |
OpenAI · 1.05MCheapest: $2 on OpenAI (flex) | $2 | $10 | $2 / $10 | $4 | 1.05M | $2 on OpenAI (flex) | · | GPT-6.1 Sol is an upgrade to GPT-6 Sol from OpenAI, positioned below the flagship GPT-6 Astra in the GPT-6 series. |
OpenAI · 1.05MCheapest: $2 on OpenAI (flex) | $2 | $10 | $2 / $10 | $4 | 1.05M | $2 on OpenAI (flex) | · | GPT-6.1 Sol Pro is the same underlying model as GPT-6.1 Sol, served with reasoning.mode set to pro for higher-quality responses on complex tasks. |
Anthropic · 1M | $4 | $20 | $4 / $20 | $8 | 1M | Lab list price | · | Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. |
Google · 1MCheapest: $2 on Google Gemini API (flex) | $2 | $10 | $2 / $10 | $4 | 1M | $2 on Google Gemini API (flex) | · | Gemini 4 Argon is Google's flagship reasoning model, built for complex software engineering, deep mathematical and scientific problem solving, and autonomous multi-step agents. |
Anthropic · 1M | $2 | $10 | $2 / $10 | $4 | 1M | Lab list price | · | Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. |
Anthropic · 1M | $5 | $25 | $5 / $25 | $10 | 1M | Lab list price | · | Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work. |
About GPT-5.6 Terra Pro
Takes files, image, text in and returns text. First listed Jul 17, 2026. Up to 128K output tokens. Blended price $4.5 per 1M tokens at 3 input to 1 output. Model id gpt-5-6-terra-pro.
Price history
List price since Jul 17, 2026, from Internet Archive snapshots of the OpenRouter catalog, then daily reads.
GPT-5.6 Terra Pro
OpenAI raised its API price: input $1 to $2 and output $6 to $12 per 1M tokens.
OpenAI cut its API price: input $1.25 to $1 and output $7.5 to $6 per 1M tokens.
OpenAI cut its API price: input $2.5 to $1.25 and output $15 to $7.5 per 1M tokens.
Questions
How much does GPT-5.6 Terra Pro cost?
$2 per million input tokens and $12 per million output tokens, with cached input at $0.2, or $1 and $6 through the Batch API.
What is the context window of GPT-5.6 Terra Pro?
1.05M tokens, with up to 128K tokens of output.
Where is GPT-5.6 Terra Pro cheapest?
Of 5 routes tracked, OpenAI is cheapest at $1 input and $6 output per million tokens.
Has GPT-5.6 Terra Pro's price changed?
Yes. The output price went from $6 to $12, first seen Aug 21, 2026.