OpenAI · Released Oct 26, 2026GPT-6.1 Terra
Fast, efficient model for visual reasoning, precise computer use, and clear, natural writing.
- Capability
- 168.1ECI · #3 of 165
- Input
- $1.00per 1M tokens
- Output
- $5.00per 1M tokens
- Context
- 1.05M128K max output
What it costs
- Input
- $1.00per million tokens
- Output
- $5.00per million tokens
- Cached input
- $0.05per million tokens
- Cache write
- $1.25per million tokens
- Over 272K tokens
- $2.00 / $7.50input / output per million
- Blended (3:1)
- $2.00pricier than 72% of priced models
Typical monthly bills
| Monthly usage | Estimated cost |
|---|---|
| Side project2M input + 0.5M output tokens | $4.50 |
| Team assistant25M input + 5M output tokens | $50.00 |
| Production app250M input + 50M output tokens | $500.00 |
Official OpenAI API price, as listed on models.dev.
Independent benchmarks
#3 of 165 scored models
The shaded band is Epoch AI’s confidence range (164.9–172.9); the tick marks the median scored model.
Scores from Epoch AI, run independently of OpenAI.
The details
- Lab
- OpenAI
- Released
- Oct 26, 2026
- Knowledge cutoff
- Jun 1, 2026
- Context window
- 1,050,000 tokens
- Max output
- 128,000 tokens
- Inputs
- Text, Images, PDFs
- Output
- Text
- Reasoning
- Adjustable effort low · medium · high · xhigh · max
- Tool calling
- Yes
- Structured output
- Yes
- Weights
- Proprietary
- API model ID
gpt-6.1-terraon OpenAI- Availability
- 22 API providerslisted on models.dev
More from OpenAI
About GPT-6.1 Terra
How much does GPT-6.1 Terra cost?
GPT-6.1 Terra costs $1.00 input / $5.00 output per million tokens (official OpenAI API price). Cached input is $0.05 per million tokens, and writing to the cache costs $1.25. Requests over 272K tokens are billed at $2.00 input / $7.50 output. At a 3:1 input-to-output mix that is $2.00 per million tokens, more expensive than 72% of the 445 priced models we track.
What is the context window of GPT-6.1 Terra?
GPT-6.1 Terra accepts up to 1,050,000 tokens per request and can write up to 128,000 tokens in one response.
How good is GPT-6.1 Terra?
Epoch AI gives GPT-6.1 Terra a Capabilities Index score of 168.1 (likely range 164.9–172.9), ranking it #3 of 165 models Epoch has scored. Epoch AI benchmark results: GPQA Diamond 94.3%, FrontierMath Tiers 1–3 90.9%, OTIS Mock AIME 2024–2025 100%, SimpleQA Verified 57.3%.
Is GPT-6.1 Terra open source?
No. GPT-6.1 Terra is proprietary; you use it through OpenAI’s API or partner platforms.
What inputs does GPT-6.1 Terra support?
GPT-6.1 Terra accepts text, images and PDFs and replies in text. It is a reasoning model with low, medium, high, xhigh and max effort settings, supports tool calling and can return structured JSON output.
When was GPT-6.1 Terra released?
OpenAI released GPT-6.1 Terra on Oct 26, 2026. Its training data runs to Jun 1, 2026.
What are the best alternatives to GPT-6.1 Terra?
The closest current models from other labs on capability, price and release date are Claude Sonnet 5.5 (Anthropic, ECI 166.7, $2.00 / $10.00), Gemini 4 Argon (Google, ECI 166.1, $2.00 / $10.00), Muse Spark 1.3 (Meta, ECI 157.4, $1.25 / $4.25) and GLM-5.3 (Z.ai (Zhipu), ECI 156.2, $1.40 / $4.40).