GPT-6.1 Terra API pricing
Official OpenAI list price, last checked Oct 29, 2026. Updated Oct 29, 2026.
GPT-6.1 Terra costs $1 per 1M input tokens and $5 per 1M output tokens, cached input at $0.05, and a 1M-token context window, per OpenAI's official pricing page (checked Oct 29, 2026). It's priced in the middle of the pack: number 50 of 77 by blended price ($2 per 1M tokens at a 3 to 1 input to output mix). On LMArena's Code Arena it ranks #11 of 50 models we price (relative score 49 out of 100). Cheaper pick: DeepSeek V4.1 Flash scores 46 against 49 on the same board at $0.525 blended, 3.8x less.
GPT-6.1 Terra price per million tokens
| GPT-6.1 Terra price per million tokens | USD |
|---|---|
| Input | $1 |
| Cached input | $0.05 |
| Output | $5 |
| Blended, 3 parts input to 1 part output | $2 |
| Context window | 1M tokens |
| Prompts above 272K | $2 in, $7.50 out |
Official note from OpenAI: New Oct 26, 2026. Prompts up to 272K. Longer prompts cost $2 in, $7.50 out.
What GPT-6.1 Terra costs for real work
List-price estimates for a month, no discounts. Our math, not a quote: change the token counts in the plan vs API calculator.
| Workload | Tokens a month | GPT-6.1 Terra | Muse Spark 1.3 | DeepSeek V4.1 Flash |
|---|---|---|---|---|
| Light: a side project or personal assistant | 2M in, 0.5M out | $4.50 | $4.62 | $1.20 |
| Medium: a small team or one product feature | 20M in, 5M out | $45.00 | $46.25 | $12.00 |
| Heavy: a production app | 200M in, 50M out | $450 | $462 | $120 |
| Medium with 80% of input cached | 20M in (16M cached), 5M out | $29.80 | $28.65 | $7.30 |
| Medium, every prompt above the long-prompt threshold | 20M in, 5M out | $77.50 | $46.25 | $12.00 |
How GPT-6.1 Terra ranks on LMArena
Relative score: 100 is the top model we price on that board. Rank is among the models in our price table, not the full leaderboard.
| Board | Rank | Score /100 |
|---|---|---|
| Coding (Code Arena) | #11 of 50 | 49 |
Closest rivals to GPT-6.1 Terra
The models nearest in price, other makers first. Ranks are on Code Arena, where we have them.
| Model | In / out | Blended | Verdict |
|---|---|---|---|
| Muse Spark 1.3 | $1.25 / $4.25 | $2 | GPT-6.1 Terra wins: same price, higher score. Compare |
| DeepSeek V4 Pro | $1.32 / $3.96 | $1.98 | GPT-6.1 Terra wins: same price, higher score. Compare |
| GLM-5.3 | $1.40 / $4.40 | $2.15 | GPT-6.1 Terra wins on both. Compare |
| GLM-5.2 | $1.40 / $4.40 | $2.15 | GPT-6.1 Terra wins on both. Compare |
Cheaper alternatives to GPT-6.1 Terra
At least 40% cheaper blended, best LMArena score first.
| Model | In / out | Blended | Verdict |
|---|---|---|---|
| DeepSeek V4.1 Flash | $0.30 / $1.20 | $0.525 | DeepSeek V4.1 Flash for price, GPT-6.1 Terra for quality. Compare |
| MiMo-V2.6 Flash | $0.14 / $0.28 | $0.175 | MiMo-V2.6 Flash for price, GPT-6.1 Terra for quality. Compare |
| MiMo-V2.6 Pro | $0.435 / $0.87 | $0.5437 | MiMo-V2.6 Pro for price, GPT-6.1 Terra for quality. Compare |
More from OpenAI
- GPT-6 Luna$0.10 in, $0.50 out per 1M
- GPT-6.1 Sol$2 in, $10 out per 1M
- GPT-6 Sol$2 in, $10 out per 1M
- GPT-5.6 Terra$2 in, $12 out per 1M
- GPT-5.6 Sol$4 in, $20 out per 1M
FAQ
How much does the GPT-6.1 Terra API cost per million tokens?
$1 per 1M input tokens and $5 per 1M output tokens, plus $0.05 per 1M for cached input, as of Oct 29, 2026. A typical 3 to 1 input to output mix works out to $2 per 1M tokens.
Does GPT-6.1 Terra charge more for long prompts?
Yes. Prompts above 272K: $2 in, $7.50 out.
Is GPT-6.1 Terra cheaper than Muse Spark 1.3?
Yes. A medium month (20M input and 5M output tokens) costs $45.00 on GPT-6.1 Terra and $46.25 on Muse Spark 1.3 at list price. On Code Arena, GPT-6.1 Terra ranks #11 and Muse Spark 1.3 #14.
How does GPT-6.1 Terra rank on LMArena?
On Code Arena it is #11 of 50 models we price, with a relative score of 49 out of 100.
What is a cheaper alternative to GPT-6.1 Terra?
DeepSeek V4.1 Flash costs $0.30 in and $1.20 out per 1M tokens, about 3.8x less blended, and scores 46 on Code Arena against 49 for GPT-6.1 Terra.
Where does this GPT-6.1 Terra price come from?
From OpenAI's official pricing page, which we check every day. This page was last checked Oct 29, 2026.