GPT-5.6 Terra API Cost Calculator

OpenAI's GPT-5.6 Terra: $2/M input · $12/M output · $0.2/M cached input. Price your own workload below.

Presets:

What GPT-5.6 Terra costs in practice

WorkloadInputOutputCost
Short chat message500250$0.0040
10-page document + summary7,000500$0.020
Agent / coding session50,00010,000$0.220
1M tokens in + 1M out1,000,0001,000,000$14.00

GPT-5.6 Terra vs nearest rivals

Closest-priced alternatives on a mixed 10K-input / 2K-output request:

ModelInput $/MTokOutput $/MTokMixed request
GPT-5.6 Terra$2$12$0.044
Gemini 2.5 Pro$1.25$10$0.033
Claude Sonnet 5$2$10$0.040
Gemini 3.1 Pro Preview$2$12$0.044

Frequently asked questions

How much does the GPT-5.6 Terra API cost?

GPT-5.6 Terra costs $2 per million input tokens and $12 per million output tokens, with cached input at $0.2 per million (90% off).

How much does a typical chat message cost with GPT-5.6 Terra?

A short chat message (about 500 input and 250 output tokens) costs roughly $0.0040 with GPT-5.6 Terra. At 1,000 such requests a day, that is about $120.00 per month.

Is GPT-5.6 Terra cheap compared to similar models?

GPT-5.6 Terra has the #17 cheapest input rate of the 26 models we track. On a mixed workload (10K input / 2K output), it costs $0.044 per request, versus $0.033 for Gemini 2.5 Pro.

Related

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Last updated 2026-08-03. Prices verified againstOpenAI's official pricing page; see themethodology.