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GPT-6.1 Terra vs Claude Haiku 5.5
GPT-6.1 Terra scores higher than Claude Haiku 5.5 on all 3 public leaderboards that rate both. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6.1 Terra is at 75 and Claude Haiku 5.5 at 50 (out of 100).
Scores as published by each board; table composed October 28, 2026.
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Leaderboard by leaderboard
| Board | GPT-6.1 Terra | Claude Haiku 5.5 | Higher |
|---|---|---|---|
| LMArena Elo (community votes) | 1,670.7 | 1,587.8 | GPT-6.1 Terra |
| Vals AI Vals Index accuracy % · weighted finance + coding tasks | 60.2 | 58.7 | GPT-6.1 Terra |
| Artificial Analysis intelligence index · measured runs only | 51 | 36.2 | GPT-6.1 Terra |
Raw scores are each board's own scale, so compare within a row, not across rows. Full table: the bench index.
GPT-6.1 Terra at a glance
- Developer
- OpenAI
- Status
- Live since October 26, 2026
- API price
- $1 input / $5 output per 1M tokens · OpenAI, gpt-6.1-terra
- Context window
- 1.05M tokens
Live — Oct 26 · $1 / $5 per MTok, cached input $0.05, cache writes $1.25 (OpenAI's model page) · 1.05M ctx / 128K out · knowledge cutoff Jun 1, 2026 · reasoning, text and image in · GPT-5.6 Terra lists at $2 / $12 on OpenRouter · first seen Oct 16-19 as the judge model in Microsoft's dotnet/efcore eval configs (PR #39217) · our sweep caught gpt-6.1-terra at 17:52 UTC and fired at 17:53 · OpenRouter added openai/gpt-6.1-terra (18:13 UTC) and openai/gpt-6.1-terra-pro (18:15) the same evening, both at $1 / $5 and 1.05M ctx · scored on LMArena, Vals and Artificial Analysis by Oct 28.
GPT-6.1 Terra is live in OpenAI's API at $1 / $5 per million tokens, under GPT-5.6 Terra's $2 / $12
2026-10-26 · OpenAI's GPT-6.1 Terra is live in its API. Our radar saw the gpt-6.1-terra id at 17:52 UTC on October 26 and fired the alert at 17:53, before OpenRouter listed it.
GPT-6.1 Terra turns up again, as a cheaper reviewer in a GitHub engineer's Copilot workflow
2026-10-25 · A second public repo now calls GPT-6.1 Terra, a model OpenAI has not announced. On October 24 at 03:48 UTC, Nate Finch, whose GitHub profile lists his company as GitHub, merged a pull request in his own public repo, natefinch/council4, that moves every review step from gpt-6.1-sol to gpt-6.1-terra at high effort.
Claude Haiku 5.5 at a glance
- Developer
- Anthropic
- Status
- Live since October 7, 2026
- API price
- $0.10 input / $0.50 output per 1M tokens · Anthropic, claude-haiku-5-5
- Context window
- 1M tokens
Live — Oct 7 · $0.10/$0.50 per MTok for prompts up to 100K tokens, $0.50/$2.50 above · cache reads $0.01 / $0.05 · 1M ctx / 128K out · knowledge cutoff Jun 2026 · in the API, the Claude apps, AWS, Google Cloud and Microsoft Foundry the same day · Anthropic's own table: OSWorld 2.1 72.4% (GPT-6 Luna 48.9%, Haiku 4.5 15.7%), Terminal-Bench 4.0 39.2% (Luna 16.4%) · Artificial Analysis Intelligence Index 43 at max effort, #2 of 179 in its price tier (read Oct 7) · our sweep fired on claude-haiku-5-5 at 17:52 UTC, OpenRouter listed it at 18:31.
Claude Haiku 5.5 is out at $0.10 / $0.50, a tenth of Haiku 4.5's price
2026-10-07 · Anthropic released Claude Haiku 5.5 on October 7 as claude-haiku-5-5, on the Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry and in the Claude apps.
GPT-6.1 Terra vs Claude Haiku 5.5: quick answers
Which is better, GPT-6.1 Terra or Claude Haiku 5.5?
It depends on what you measure. GPT-6.1 Terra scores higher than Claude Haiku 5.5 on all 3 public leaderboards that rate both. GPT-6.1 Terra's widest lead is on LMArena. On the ArtificialWatch Index, which takes the median of each model's percentile across the boards that score it, GPT-6.1 Terra is at 75 and Claude Haiku 5.5 at 50 (out of 100).
Which is newer, GPT-6.1 Terra or Claude Haiku 5.5?
GPT-6.1 Terra. It went live on October 26, 2026, 19 days after Claude Haiku 5.5 (October 7, 2026).
Which is cheaper, GPT-6.1 Terra or Claude Haiku 5.5?
Claude Haiku 5.5 is cheaper on both input and output. On each vendor's own API, GPT-6.1 Terra is $1 input / $5 output per million tokens and Claude Haiku 5.5 is $0.10 input / $0.50 output per million tokens. GPT-6.1 Terra's rate rises for prompts over 272K tokens; Claude Haiku 5.5's rate rises for prompts over 100K tokens. Prices as published in the models.dev catalog, as of 2026-10-27.
Which has the bigger context window, GPT-6.1 Terra or Claude Haiku 5.5?
GPT-6.1 Terra, at 1.05M tokens against Claude Haiku 5.5's 1M, as each vendor lists it.
Who makes GPT-6.1 Terra and Claude Haiku 5.5?
GPT-6.1 Terra is from OpenAI; Claude Haiku 5.5 is from Anthropic.
Where do these numbers come from?
Each score is the leaderboard's own published figure, read by ArtificialWatch (table composed October 28, 2026). Boards measure different things, so raw scores are only comparable within a row.
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