# GPT-6.1 Terra vs GPT-6 Astra (and Sol): price and specs

Canonical: https://theagenticweekly.com/compare/gpt-6-1-terra-vs-gpt-6-astra · Last verified: 2026-10-27 · Published: 2026-10-27 · Author: Agentic Weekly (operated independently from Texas, US) · Evidence: Evidence: Reported. Prices, context windows and release dates are from OpenAI's model pages as recorded in our model data; performance statements are OpenAI's claims, not our measurements read from the sources listed below on 2026-10-27 (America/Chicago). We did not run these products or models for this page.

> GPT-6.1 Terra is OpenAI's cheap tier at $1 / $5 per million input / output tokens, a tenth of GPT-6 Astra's $10 / $50. GPT-6.1 Sol sits between at $2 / $10; OpenAI says it performs close to Astra at a fifth of the price, a vendor claim we have not measured. OpenAI's models page lists no GPT-6.1 Astra. Prices read Oct 26, 2026.

Method: Prices, context windows and release dates are vendor list data copied from OpenAI's model pages into our model records with the date we read them (Oct 26, 2026). Reported means read from that page, not run by us; Tested would mean we ran it and logged a dated run, and neither model here is Tested. Performance statements are OpenAI's claims.

Data: [models.json](https://theagenticweekly.com/models.json) · [models.csv](https://theagenticweekly.com/models.csv) · [answers.json](https://theagenticweekly.com/answers.json)

## Price and specs

Table: GPT-6.1 Terra, GPT-6 Astra, GPT-6.1 Sol and GPT-6 Sol

|  | GPT-6.1 Terra | GPT-6 Astra | GPT-6.1 Sol | GPT-6 Sol |
|---|---|---|---|---|
| Input / output, USD per 1M tokens | $1 / $5 | $10 / $50 | $2 / $10 | $2 / $10 |
| Cached input | $0.05 | n/a | $0.10 | $0.20 |
| Context window | 1,050,000 tokens | 1,050,000 tokens | 1,050,000 tokens | not listed |
| Released | Oct 26, 2026 | Sep 3, 2026 | Sep 29, 2026 | Sep 22, 2026 |
| OpenAI's positioning | Cheapest of the 6.1 tier | "Flagship for complex reasoning and coding" | Near-flagship, per OpenAI | Mid-priced GPT-6 reasoning model |
| Source | [model page](https://developers.openai.com/api/docs/models/gpt-6.1-terra) | [model page](https://developers.openai.com/api/docs/models/gpt-6-astra) | [model page](https://developers.openai.com/api/docs/models/gpt-6.1-sol) | [model page](https://developers.openai.com/api/docs/changelog) |

## Which to use

- Cheapest that is still current: Terra, at a tenth of Astra's price.
- Hardest reasoning and coding, price secondary: Astra, OpenAI's stated flagship.
- A middle path: Sol, which OpenAI positions as close to Astra for a fifth of the price (vendor claim).
- None of these is Tested by us. For third-party rankings see [best AI models for coding](https://theagenticweekly.com/best/llm-for-coding).

## FAQ

### What is the difference between GPT-6.1 Terra and GPT-6 Astra?

Price and tier: Terra is $1 / $5 per 1M tokens, Astra $10 / $50. OpenAI calls Astra its flagship for complex reasoning and coding; Terra is the budget model. Same context window (1,050,000 tokens).

### What is the difference between GPT-6 Astra and GPT-6 Sol?

Astra is $10 / $50 per 1M tokens and Sol $2 / $10, so Sol is a fifth of the price. Astra is the flagship; Sol is mid-priced. We have not measured the quality gap.

### Did OpenAI scrap GPT-6.1 Astra?

We cannot say. OpenAI's models page (read Oct 27, 2026) lists no GPT-6.1 Astra, and we found no OpenAI statement about one, so we treat it as not released.

## Sources

- [OpenAI models](https://developers.openai.com/api/docs/models) (fetched 2026-10-27)
- [GPT-6.1 Terra model page](https://developers.openai.com/api/docs/models/gpt-6.1-terra) (fetched 2026-10-26)
- [GPT-6 Astra model page](https://developers.openai.com/api/docs/models/gpt-6-astra) (fetched 2026-10-26)
- [GPT-6.1 Sol model page](https://developers.openai.com/api/docs/models/gpt-6.1-sol) (fetched 2026-10-26)
- [GPT-6 Sol model page](https://developers.openai.com/api/docs/changelog) (fetched 2026-10-26)

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## Changelog

- 2026-10-27: First published. Facts read from the sources listed below on this date.

## How to cite

Agentic Weekly, "GPT-6.1 Terra vs GPT-6 Astra (and Sol): price and specs", last updated 2026-10-27, https://theagenticweekly.com/compare/gpt-6-1-terra-vs-gpt-6-astra