# GPT-5.6 Terra vs GPT-5.5 (2026): Price, Context & Verdict | Alher Tech

> GPT-5.6 Terra vs GPT-5.5: head-to-head 2026 comparison across pricing, context window, modality and licence. Verdict + use cases.

- Canonical page: https://alhertech.com/en/ai-comparison/gpt-5-6-terra-vs-gpt-5-5/
- Site: Alher Tech (custom software, AI agents and SEO engineering, https://alhertech.com/)
- Contact: https://alhertech.com/en/contact/

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|  | GPT-5.6 Terra | GPT-5.5 |
| --- | --- | --- |
| Price in/out ($/M) | $1 / $6 | $5 / $30 |

## Our verdict

Terra undercuts GPT-5.5 hard, $1 / $6 per M tokens against $5 / $30, five times cheaper on both sides, and it brings a 1.05M context window against 600K. The catch is the same one that bites the whole GPT-5.6 line: GPT-5.5 takes text, vision and audio, and Terra only takes text and vision. If any part of your product speaks or listens, this is not a migration, it is a rewrite. The second catch is that OpenAI publishes no benchmarks for Terra, so the numbers you can compare are price, context and modality, and nothing else. Where GPT-5.5 is measured, it is strong: 66% on SWE-bench Verified, 92% on AIME, 1432 Arena Elo. For high volume text and vision work Terra is the obvious cost move, but benchmark it on your own workload first, because nobody else has.

[GPT-5.6 Terra](https://alhertech.com/en/ai-comparison/gpt-5-6-terra/) · [GPT-5.5](https://alhertech.com/en/ai-comparison/gpt-5-5/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)