GPT-6.1 Terra API pricing

By the aitokensai editors · Verified 2026-10-31 Sources: OpenAI official pricing

The lighter GPT-6.1 tier, priced below Sol. Available at listed at platform rate (no published official USD price).

USD, standard tier. Rate read from the live rate config on 2026-10-31. OpenAI publishes no USD list price for this model, so nothing here is cross-checked against one — this is a gateway rate, not a discount.

Specifications

What GPT-6.1 Terra costs at your volume

Calculated at $0.5 input / $2.5 output per 1M tokens, 5.0× apart on this model, assuming a 5:1 input-to-output ratio. That ratio is the single largest source of error in this table: resend-heavy workloads drift well past it, and at 5.0× the correction is not linear. The cost calculator takes the actual figures.

When GPT-6.1 Terra is the right call

At $0.5 in and $2.5 out per million tokens, GPT-6.1 Terra lands where most production deployments actually live — cheap enough to leave running, expensive enough that you still look at the bill. The 5.0× output multiple is conventional, so standard cost intuition holds: output dominates, context matters, neither is pathological.

It is not the answer at either end. Bulk classification finds identical results several times cheaper, and the hardest reasoning problems reward moving up rather than staying here. Everything in between is this model's ground.

Where GPT-6.1 Terra sits in the index

GPT-6.1 Terra is 106 of 226 on input rate and 136 of 226 on output rate. A gap of 30 places, because on this model the output rate is 5.0× the input rate, steeper than the index median of 4.0× An output-heavy workload therefore pushes it 30 places down the table, which is why the cheapest model per input token is routinely not the cheapest per task. Percentile is the share of the 226 models in this index that cost more than GPT-6.1 Terra.

On an agent mix the lowest blended rate in the same index is Gemma2 9B It at $0.01 per 1M tokens (about 200).0× less than this model at the same ratio. Across the whole index, sorting by input price alone moves a model by as much as 74 places; on GPT-6.1 Terra specifically the shift is 30 — which is what the re-ranked index exists to show.

GPT-6.1 Terra is 106 of 226 across every model in the index; the comparison that usually settles a choice is OpenAI's own lineup further down.

GPT-6.1 Terra among OpenAI's 12 models

GPT-6.1 Terra is the 5th cheapest of OpenAI's 12 models in this index at $0.5 per 1M input tokens. The range inside that group runs from GPT-5 nano at $0.025 to GPT-6 Astra at $5, a spread of 200×, and this one sits at 20.0× the group's cheapest tier.

On input rate alone, stepping up to GPT-5 costs 1.2× the input rate and dropping to GPT-5 mini cuts it by 75%. Both measured at 2026-10-31, the same check as every other rate on this page.

Full OpenAI range, including models outside this shortlist: OpenAI rate index.

Similarly priced alternatives

Blended comparison (input + output per 1M). Price is one axis These are the three closest to GPT-6.1 Terra in blended rate, not interchangeable substitutes for it.

Calling GPT-6.1 Terra

The identifier you send is gpt-6.1-terra. Copy it exactly, because a mismatch returns a model error rather than a connection error, which sends most people to debug the wrong thing. Everything else is a base URL argument (GPT-6).1 Terra's own SDKs work unchanged.

from openai import OpenAI

client = OpenAI(base_url="https://aicomp.ai/v1", api_key="sk-...")

resp = client.chat.completions.create(
    model="gpt-6.1-terra",
    messages=[
        {"role": "system", "content": "Answer in one short paragraph."},
        {"role": "user", "content": "Explain what changed in this release."},
    ],
    max_tokens=300,
)

# prompt_tokens / completion_tokens 是真实账单的唯一依据 —— 记下来，别猜
print(resp.usage.prompt_tokens, resp.usage.completion_tokens)

Log the usage object on every call, not just while you are optimising. On GPT-6.1 Terra output costs 5.0× what input costs, so the same monthly token count bills very differently depending on how much of it comes back as output — measure your own split before extrapolating from the headline input rate, because rates move with vendor promotions.

Setting it up

Pointing an existing integration at GPT-6.1 Terra is a base URL change, not a rewrite. Pick your tool:

• Claude Code — set the base URL via environment variables
• Cursor — override the API endpoint in settings
• OpenAI / Anthropic SDK — one base_url argument
• Python, sync, streaming and async examples
• Cutting the bill — eight levers ranked by effect

What different usage shapes cost on GPT-6.1 Terra

A monthly token budget does not convert cleanly into a monthly invoice, and GPT-6.1 Terra is an ordinary case rather than an extreme one: output is priced at 5.0× input, above the median of 4.0× across the 226 models in our index. Everything follows from that one number At 5:1 it is manageable, at 1:1 the same token count costs half as much. Below are five shapes real GPT-6.1 Terra deployments fall into, each costing it out at the split it actually produces.

The cheapest comparison is GPT-5 nano at $0.025 / $0.2 per 1M — 13.3× cheaper than GPT-6.1 Terra on a blended rate. Treat it as a rate floor, not a recommendation: it says nothing about whether GPT-5 nano can do the work you need GPT-6.1 Terra for.

Read the table as a sanity check rather than a forecast. If your own output share sits anywhere near 3%, everything above is priced almost entirely at GPT-6.1 Terra's $0.5 input rate; at 40% the $2.5 output rate has taken the larger half. Nobody's split is exactly the one you assumed when you picked the model, which is why the calculator asks for it before quoting anything.

FAQ

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