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gpt-6.1-terra API pricing, specs and examples · CheaperInference

Provider: OpenAI
Model ID: gpt-6.1-terra
Type: Text generation
Endpoints: /v1/chat/completions, /v1/responses, /v1/messages
Input: image, pdf, text
Output: text
Vision input: Supported
Image editing: Not supported
Video input: Not supported
Reasoning: Supported
Streaming: Supported
Context window: 1,050,000 tokens
Maximum output: 128,000 tokens

POST /v1/chat/completions

curl https://api.cheaperinference.com/v1/chat/completions \  -H "Authorization: Bearer ci_live_YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "model": "gpt-6.1-terra",    "messages": [      {        "role": "user",        "content": "Reply with the single word OK."      }    ]  }'

POST /v1/responses

curl https://api.cheaperinference.com/v1/responses \  -H "Authorization: Bearer ci_live_YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "input": [      {        "role": "user",        "content": "Reply with the single word OK."      }    ],    "model": "gpt-6.1-terra",    "store": false  }'

POST /v1/messages

curl https://api.cheaperinference.com/v1/messages \  -H "Authorization: Bearer ci_live_YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "model": "gpt-6.1-terra",    "messages": [      {        "role": "user",        "content": "Reply with the single word OK."      }    ],    "max_tokens": 1024  }'

Workloads to evaluate

Evaluate summarization, drafting, and question answering with examples from your own application.
Include image-based questions when your request uses a supported image input format.
Test tool calls against your application's actual function schemas before connecting actions.
Compare the available reasoning settings on tasks where additional deliberation is useful.

Limits and tradeoffs

Requests above 272,000 input tokens may use a different price tier; the pricing section lists that tier separately.
Reported capabilities and production speed measurements describe access and observed traffic; task quality still needs an evaluation with your own examples.

Capability source · checked 2026-10-26

$1.4625 estimated at displayed rates

1,000,000 ÷ 1,000,000 × $0.65 + 250,000 ÷ 1,000,000 × $3.25

The same billed quantities at the listed reference rates: $2.25.

Uses uncached input at the displayed standard rates, with no extra modalities or tools. Billed output includes any charged reasoning tokens. Actual token counts, price tiers, and marketplace prices can change the total.

Price quote effective Nov 1, 2026, 10:25 AM UTC.

Current model pricing and context compared with related models
Model	Current pricing	Context limit	Image input listed
gpt-6.1-terra (this model)OpenAI	$0.65 input / $3.25 output per 1M tokens	1,050,000 tokens	Yes
gpt-5.6-terraOpenAI	$0.914803 input / $5.488816 output per 1M tokens	1,050,000 tokens	Yes
gpt-5.6-terra-fastOpenAI	$3.40 input / $20.40 output per 1M tokens	1,050,000 tokens	Yes
gpt-6.1-terra-fast

POST /v1/chat/completions

Field	Values
reasoning.exclude
max_tokens
reasoning	effort: none, low, medium, high, xhigh, max; enabled: true or false
response_format
stop
temperature
tool_choice
tools

POST /v1/messages

Field	Values
max_tokens
thinking	type: enabled with budget_tokens; output_config.effort: none, low, medium, high, xhigh, max
output_config.format
stop_sequences
temperature
tool_choice
tools

POST /v1/responses

Field	Values
max_output_tokens
reasoning	effort: none, low, medium, high, xhigh, max
text.format
temperature
tool_choice
tools

gpt-6.1-terra

What you pay

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At a glance

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About gpt-6.1-terra

Workloads to evaluate

Limits and tradeoffs

Example: 1,000 text requests

Compare gpt-6.1-terra with related models

Parameters by endpoint

Pricing history

gpt-6.1-terra

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