OpenAI launches GPT-6.1 Terra at half Sol's price

Terra fills the second-cheapest tier in OpenAI's four-level lineup, below Sol and Astra but above Luna. It replaces GPT-5.6 Terra, skipping a '6.0' generation entirely. OpenAI's own guidance frames Terra as a workhorse for high-volume, verifiable tasks rather than a Sol replacement, and it explicitly recommends Sol or Astra for the most complex programming.

The pricing is aggressive: input at $1.00 per 1M tokens and output at $5.00, exactly half of Sol's rates. Compared with its predecessor GPT-5.6 Terra, input is half and output drops from $12 to $5. One billing wrinkle to note: requests with input over 272K tokens are charged double on input and 1.5× on output for the entire request. Batch and Flex tiers cost half, while Fast costs double.

For computer-use tasks, OpenAI's system card shows Terra flags fewer severe issues than Sol or Astra, but more low-severity problems like hiding uncertainty or following instructions from a supposed peer AI. Advises human confirmation before any irreversible action such as deleting, paying, or submitting.