GPT-6.1 Terra API Pricing
OpenAI · context window 1.1M · prices updated 2026-10-30
Where GPT-6.1 Terra sits on price
At $5.00 per million output tokens, GPT-6.1 Terra is a premium tier model — 2.3× the median output price of $2.20, which puts it cheaper than 36% and pricier than 64% of the models we track. It sits 42th cheapest of the 98 OpenAI models we track. Output costs 5.0× input, the usual spread — trim both, starting with the answer length.
Cached input is 95% cheaper. On an input-heavy workload you need roughly a 26% cache-hit rate to take 25% off the input line — reachable for chatbots and agents that resend the same system prompt and history.
What real workloads cost on GPT-6.1 Terra
These three workloads are the ones teams actually run on a premium-priced model — a $5.00/1M model is not bought for the same job as one ten times the price.
| Workload | Per request | Per month |
|---|---|---|
| Support chatbot — 500 conversations/day (5K in / 1.4K out) Conversation history re-sent each turn — the classic prompt-caching win. | $0.012 | $180 |
| Coding agent — 300 sessions/day (60K in / 12K out) Multi-step loops re-read the same files; caching matters more than raw price. | $0.12 | $1080 |
| Long-context analysis — 200 runs/day (250K in / 4K out) Only possible on large-context models; input cost is nearly the whole bill. | $0.27 | $1620 |
Model your exact traffic in the API cost calculator — it preloads GPT-6.1 Terra with caching and batch options.
GPT-6.1 Terra price history
GPT-6.1 Terra's price has not moved since we began tracking it on Oct 27, 2026 — 3 days of stability in a market where 102 of the 373 models we track have repriced over the same period, including 12 of OpenAI's own 98 models.
Change-points from our daily price snapshots (tracking since Oct 27, 2026; intraday moves between snapshots are not captured).
GPT-6.1 Terra vs Claude Sonnet 5.5 (batch)
The closest-priced alternative from another vendor is Claude Sonnet 5.5 (batch) (Anthropic) — priced within a rounding error on output, with identical input pricing. When two models land this close on price, the decision is quality on your own workload, not the price sheet: run 50 real requests through both and compare.
See Claude Sonnet 5.5 (batch) pricing →Cheaper alternatives
More OpenAI models
Frequently asked questions
› How much does the GPT-6.1 Terra API cost?
GPT-6.1 Terra costs $1.00 per million input tokens and $5.00 per million output tokens, with cached input at $0.05 per million (95% cheaper). That works out to roughly 200,000 output tokens per dollar.
› What does the support chatbot workload cost on GPT-6.1 Terra?
Support chatbot — 500 conversations/day (5K in / 1.4K out) costs about $0.012 per request and $180 per month on GPT-6.1 Terra. Conversation history re-sent each turn — the classic prompt-caching win.
› What does it cost to fill GPT-6.1 Terra's 1.1M context window?
Sending 1.1M of input in a single request costs $1.05 at $1.00 per million tokens — before any output. With prompt caching that same fill drops to about $0.0525 on repeat requests. This is why large context windows are cheap to advertise and expensive to actually use.
› Is GPT-6.1 Terra worth the price?
GPT-6.1 Terra sits in the middle of the market (42 of 98 by price within OpenAI). The honest test is a routing experiment: send the same 200 real requests to this model and to a tier below, and compare failure rate against the price gap — most teams find a majority of traffic never needed the pricier model.