OpenAI

GPT-6.1 Terra API pricing.

GPT-6.1 Terra is OpenAI’s model on the API market, released 26 Oct 2026. Prices are per million tokens in USD, as last read from the price list.

$1.00Input / 1M
$5.00Output / 1M
1.1MContext
128KMax output
Capability scores
Epoch AI
Maths3 of 4 benchmarks95
Science and knowledge2 of 2 benchmarks75
CodingNot tested by Epoch
Reasoning and puzzles1 of 2 benchmarks71
Agents and long tasks2 of 3 benchmarks74

Each bar is this model's score in that area. The white tick marks the best score any model Epoch has tested reaches there.

Epoch Capabilities Index
168
Range 165 to 173 · #3 of 271 models Epoch has scored
Maths
95average of 3 of 4 Epoch results
FrontierMath (tiers 1 to 3) (max)91%
FrontierMath (tier 4) (max)93%
OTIS Mock AIME (max)100.0%
Science and knowledge
75average of 2 of 2 Epoch results
GPQA Diamond (max)94%
SimpleQA Verified (max)57%
Reasoning and puzzles
71average of 1 of 2 Epoch results
Mystery game puzzles (max)74%
Agents and long tasks
74average of 2 of 3 Epoch results
Furniture assembly (max)79%
EBR-bench (game agent) (max)78%

The index combines many benchmarks into one general-capability score; the range is how sure Epoch is of the number. Each area score is this site's average of the model's Epoch results in that area, where 0 is what guessing would score and 100 is perfect. Compare every model, and value for money →

Source: Epoch AI, Capabilities & benchmarking (licensed CC BY 4.0). Data refreshed 2 November 2026. These are Epoch's own tests; other benchmark sites can rank models differently.

Specification
USD per million tokens
Provider
OpenAI
Model id
openai/gpt-6.1-terra
Input
$1.00
Output
$5.00
Cached input
$0.050
Context window
1.1M tokens
Maximum output
128K tokens
Takes
file, image, text
Returns
text
Tool use
Yes
Reasoning
Yes
Released
26 Oct 2026
First tracked
26 Oct 2026

At $1.00 per million input tokens, GPT-6.1 Terra is dearer than 227 of the 340 models on the price list.

Price changes
Tracked since 17 Sept 2026

No price change has been recorded since tracking began on 17 Sept 2026. Prices are checked every six hours, and any change is listed here and on model changes.

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Coverage
5 stories
  1. SiliconANGLE AI ·
    OpenAI launches GPT-6.1 Terra for faster, better-performing AI agents at half the price
  2. Simon Willison's Weblog ·
    GPT-6.1 Terra
  3. The Register AI + ML ·
    OpenAI rolls out budget-priced mid-tier GPT-6.1 Terra
  4. The Decoder ·
    GPT-6.1 Terra halves OpenAI's API prices and still gains ground on its larger models
  5. OpenAI News ·
    Introducing GPT-6.1 Terra
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Prices and specifications come from OpenRouter’s catalogue, last read 2 Nov 2026. A provider’s own price may differ; how this is collected.