GPT-5.6 Terra API

GPT-5.6 Terra is a large language model by OpenAI, available on the Venice API as openai-gpt-56-terra. Requests are anonymized, so the provider never sees your identity.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 tasks where capability and cost need to be balanced.

GPT-5.6 Terra API pricing

Model ID	Variant	Privacy	Price
`openai-gpt-56-terra`	Standard	Anonymized	$2.50 input /$ 15.00 output per 1M tokens

GPT-5.6 Terra specifications

Spec	Value
Provider	OpenAI
Released	Jul 9, 2026
Privacy	Anonymized
Context window	1M tokens
Max output	125K tokens
Reasoning effort	none, low, medium, high, xhigh, max

How to use the GPT-5.6 Terra API

Send requests to POST https://api.venice.ai/api/v1/responses with "model": "openai-gpt-56-terra" and your API key.

curl https://api.venice.ai/api/v1/responses \
  -H "Authorization: Bearer $VENICE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai-gpt-56-terra",
    "input": "Explain TEE attestation in two sentences.",
    "reasoning": { "effort": "high" }
  }'

GPT-5.6 Terra API FAQ

How much does the GPT-5.6 Terra API cost?

2.50 per 1M input tokens and

15.00 per 1M output tokens, with cached input at $0.25 per 1M. Prices are in USD and can be paid in DIEM at parity.

What is the GPT-5.6 Terra model ID?

Use openai-gpt-56-terra as the model parameter.

Is the GPT-5.6 Terra API private?

GPT-5.6 Terra is anonymized: Venice forwards requests to the provider without your identity, but the provider may retain prompt data, so use a private model for sensitive work.

What is the context window of GPT-5.6 Terra?

1M tokens of context, with up to 125K output tokens per response.

What does GPT-5.6 Terra support?

GPT-5.6 Terra supports function calling, structured outputs, reasoning, image input, web search and prompt caching. Reasoning effort is adjustable with reasoning_effort: none, low, medium, high, xhigh and max (default high).

Which endpoint does the GPT-5.6 Terra API use?

Call POST /responses. /chat/completions is also supported. OpenAI reasoning models are designed around the Responses API: reasoning, tool calls and messages come back as typed output items. Venice’s /responses endpoint is in alpha.

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