gpt-5.6-terra

openaimodel ID gpt-5.6-terra-63%63% OFF

gpt-5.6-terra costs $0.74 per million input tokens and $4.44 per million output tokens through the KoRouter API — 63% below OpenAI's official rate, pay as you go with credits.

Context window922K input tokens
Input modalitiestext, image, file
Output modalitiestext

Call it in one request

curl · gpt-5.6-terra

curl https://korouter.ai/v1/chat/completions \
  -H "Authorization: Bearer sk-your-key" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-5.6-terra",
    "messages": [{ "role": "user", "content": "Hello" }]
  }'

gpt-5.6-terra answers on the OpenAI-compatible endpoint, so anything that accepts an OPENAI_BASE_URL — Codex, Cline, Continue, Aider, Open WebUI, the OpenAI SDKs — needs the base URL, a key, and this model ID. Setup guides per tool.

Replace sk-your-key with a key from the console. Model IDs are bare names — see the docs.

What a real coding session costs

Per-token price tables mislead for agentic coding. A focused two-hour Claude Code session re-sends its context on every request, so 88% of its tokens are cache reads rather than fresh input — and the cache rate, not the headline input price, decides most of the bill. Priced at gpt-5.6-terra's live rates, that session costs $1.32 through KoRouter, against $3.58 at OpenAI's official prices.

Cache reads · 5M tokens$0.37
Fresh input · 250K tokens$0.18
Output · 100K tokens$0.44
Cache writes · 350K tokens$0.32
Session total$1.32

The token mix is a stated assumption, not a measurement — change it and re-price every model in the cost calculator, or read the full worked example in what a real Claude Code session costs. Prices come from the live billing catalog.

The same session elsewhere

The same reference session, priced at each model's live KoRouter rates — the nearest options on either side of gpt-5.6-terra.

Supported parameters

max_tokensmax_completion_tokensreasoningreasoning_effortinclude_reasoningtoolstool_choiceparallel_tool_callsresponse_formatstructured_outputsweb_search_options

More models

gpt-6.1-sol gpt-6-astra gpt-5.6-sol gpt-6-sol claude-opus-5-5 deepseek-v4.1-flash claude-fable-5.1 claude-sonnet-5-5

Prices use the live billing catalog · live availability · all models