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gpt-5.6-terra

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, offering strong performance at roughly half the cost of Sol.

VisionReasoningTool callingCachingWeb searchJSON schema
Try gpt-5.6-terraCompareDocs

Specifications

Context window1.1M tokens
Max output128K tokens
API typechat
AddedJul 10, 2026
Model IDopenai-responses/gpt-5.6-terra
Data retentionYes (30 days)
Used for trainingNo
Provider location🇺🇸 US
Privacy policyOpenAI Privacy Policy→

Benchmarks

Released 2026-07-09
Coding Indexcoding
76.7%

Artificial Analysis Coding Index — a composite of coding evaluations including LiveCodeBench, SciCode and Terminal-Bench.

GPQA Diamondreasoning
92.5%

Graduate-level physics, chemistry & biology questions designed to resist Googling.

Intelligence Indexreasoning
55.0%

Artificial Analysis Intelligence Index — a composite of multiple evaluations measuring overall model capability.

Scores are sourced from official model cards, Artificial Analysis, and public leaderboards. Benchmarks measure specific skills and do not capture every aspect of model quality. Always test on your own workload.

Pricing

Input / 1M
$2.50
Output / 1M
$15.00
Cache write
N/A
Cache read / 1M
$0.25
Estimated cost
100K input + 10K output$0.40
1M input + 100K output$4.00
10M input + 1M output$40.00

Requesty charges exactly what the upstream provider charges, no markup, no per-request fees. Prompt caching and smart routing can reduce effective cost by 30-80%.

Quickstart

Drop-in compatible with the OpenAI SDK. Change the base URL, swap in your Requesty API key, and set the model to openai-responses/gpt-5.6-terra.

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from openai import OpenAI

client = OpenAI(
    api_key="YOUR_REQUESTY_API_KEY",
    base_url="https://router.requesty.ai/v1",
)

response = client.chat.completions.create(
    model="openai-responses/gpt-5.6-terra",
    messages=[
        {"role": "user", "content": "Explain quantum computing in one paragraph."},
    ],
)

print(response.choices[0].message.content)

Other OpenAI Responses models

gpt-5.6-luna
1.1M ctx$1.00/1M
Coding 71
gpt-5.6-sol
1.1M ctx$5.00/1M
Coding 77
gpt-5.5
1.1M ctx$5.00/1M
Coding 75
gpt-5.5-pro
1.1M ctx$30.00/1M
gpt-5.4-nano
400K ctx$0.20/1M
Coding 56
gpt-5.3-chat
128K ctx$1.75/1M

Frequently asked questions

How much does gpt-5.6-terra cost?
gpt-5.6-terra is priced at $2.50 per million input tokens and $15.00 per million output tokens when accessed via Requesty. Prompt caching is supported, which can cut effective input cost by up to 90% on repeated context. Requesty charges exactly what the upstream provider charges, we don't add markup.
What is the context window of gpt-5.6-terra?
gpt-5.6-terra has a context window of 1.1M tokens, with a maximum output of 128K tokens per response. That's roughly 1,400 words of input you can fit in a single prompt.
How does gpt-5.6-terra perform on benchmarks?
gpt-5.6-terra scores 92.5% on GPQA Diamond, 86.3% on τ²-Bench, 76.7% on Coding Index. See the full benchmark chart above for results across MMLU Pro, GPQA Diamond, SWE-Bench Verified, HumanEval, MATH, AIME, MMMU, and LiveBench.
What can gpt-5.6-terra do?
gpt-5.6-terra supports vision input, tool calling, extended reasoning, prompt caching, web search, structured outputs (JSON schema). You can call it through any OpenAI-compatible client by pointing base_url to Requesty.
How do I use gpt-5.6-terra with the OpenAI SDK?
Install the OpenAI SDK, set base_url to "https://router.requesty.ai/v1", set your API key to your Requesty key, and set the model to "openai-responses/gpt-5.6-terra". The Quickstart above shows Python, JavaScript and cURL snippets.
Can I run gpt-5.6-terra through Requesty?
Yes. gpt-5.6-terra runs through Requesty's OpenAI-compatible API, served from OpenAI Responses. You do not host the model yourself: point base_url at Requesty, set the model to "openai-responses/gpt-5.6-terra", and requests are routed to the upstream provider with automatic failover. The same key gives you 400+ other models too.

Access gpt-5.6-terra through Requesty

One API key, 400+ models, OpenAI-compatible. No markup on provider prices, automatic failover, and smart caching built-in.

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