# GPT-6.1 Terra vs Claude Haiku 5.5

> Markdown mirror of https://router.one/models/compare/gpt-6-1-terra-vs-claude-haiku-5-5 for AI assistants and crawlers. Router One is a unified, OpenAI-compatible LLM API gateway.

Claude Haiku 5.5 is the lower-priced of the two on Router One at base-tier rates (GPT-6.1 Terra: request input ≤ 272,000 tokens; Claude Haiku 5.5: request input ≤ 100,000 tokens) — about 70% less on a 1M-input + 1M-output mix. Both carry a 1.05M context window. GPT-6.1 Terra answers on /v1/chat/completions and /v1/responses (Codex CLI); Claude Haiku 5.5 on /v1/chat/completions and /v1/messages (Claude Code).

GPT-6.1 Terra and Claude Haiku 5.5 compared on current per-token rates, context window, and capabilities — both callable through one OpenAI-compatible endpoint with per-request cost traces.

## GPT-6.1 Terra vs Claude Haiku 5.5: rates, context window, and capabilities

| Spec | GPT-6.1 Terra | Claude Haiku 5.5 |
| --- | --- | --- |
| Input / 1M tokens | $0.20 | $0.06 |
| Output / 1M tokens | $1.00 | $0.30 |
| Cached input / 1M tokens | $0.01 | $0.006 |
| Context window | 1.05M | 1.05M |
| Capabilities | Chat, Streaming, Tool calling, Vision | Chat, Streaming, Tool calling, Vision |
| Subscription plans | Not in any plan — wallet | Not in any plan — wallet |
| Detail page | [GPT-6.1 Terra](https://router.one/models/gpt-6-1-terra) | [Claude Haiku 5.5](https://router.one/models/claude-haiku-5-5) |

GPT-6.1 Terra: request input ≤ 272,000 tokens: Input $0.20 / 1M tokens, Output $1.00 / 1M tokens, Cache write $0.25 / 1M tokens, Cached input $0.01 / 1M tokens; request input > 272,000 tokens: Input $0.40 / 1M tokens, Output $1.50 / 1M tokens, Cache write $0.50 / 1M tokens, Cached input $0.02 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold.

Claude Haiku 5.5: request input ≤ 100,000 tokens: Input $0.06 / 1M tokens, Output $0.30 / 1M tokens, Cache write $0.075 / 1M tokens, Cached input $0.006 / 1M tokens; request input > 100,000 tokens: Input $0.30 / 1M tokens, Output $1.50 / 1M tokens, Cache write $0.375 / 1M tokens, Cached input $0.03 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold.

## What does 1M tokens cost on GPT-6.1 Terra vs Claude Haiku 5.5?

Base-tier rates: For a workload of 1M input plus 1M output tokens at current rates: GPT-6.1 Terra comes to $1.20, Claude Haiku 5.5 comes to $0.36 — Claude Haiku 5.5 is about 70% cheaper on this mix. Real workloads skew heavily toward input tokens, so weigh the input rate by your own ratio; the cached-input row above is the posted catalog rate for that model.

## Switch between GPT-6.1 Terra and Claude Haiku 5.5

The API key and base URL stay the same, but this is not a one-string switch for every client or request. The model pages list GPT-6.1 Terra on /v1/responses and /v1/chat/completions, and Router One serves Claude Haiku 5.5 on /v1/messages and /v1/chat/completions, so Codex CLI (/v1/responses) runs only the GPT side and Claude Code (/v1/messages) only the Claude side. Per OpenAI's GPT-6 guide (checked 2026-10-28), GPT-6.1 Terra takes tool calls only on the Responses API and, at any reasoning effort other than none, no temperature, top_p or logprobs settings; per Anthropic's Claude Haiku 5.5 migration guide (checked 2026-10-10), Claude Haiku 5.5 returns a 400 for sampling settings it does not accept (omit temperature, top_p and top_k) and for an assistant prefill as the last turn. As of the 2026-10-28 plan response, both models are in no plan tier and bill the wallet per token.

`compare.sh`

```bash
curl https://api.router.one/v1/chat/completions \
  -H "Authorization: Bearer sk-your-router-one-key" \
  -H "Content-Type: application/json" \
  -d '{"model": "openai/gpt-6.1-terra", "messages": [{"role": "user", "content": "Hello"}]}'

# Same request, other model — change one string:
#   "model": "anthropic/claude-haiku-5.5"
```

## FAQ

### Is GPT-6.1 Terra cheaper than Claude Haiku 5.5?

Compared at base-tier rates (GPT-6.1 Terra: request input ≤ 272,000 tokens; Claude Haiku 5.5: request input ≤ 100,000 tokens). Input: GPT-6.1 Terra $0.20 vs Claude Haiku 5.5 $0.06 / 1M tokens; Claude Haiku 5.5 has the lower rate. Output: GPT-6.1 Terra $1.00 vs Claude Haiku 5.5 $0.30 / 1M tokens; Claude Haiku 5.5 has the lower rate. Total cost depends on the workload's input, output and cache usage. GPT-6.1 Terra: request input ≤ 272,000 tokens: Input $0.20 / 1M tokens, Output $1.00 / 1M tokens, Cache write $0.25 / 1M tokens, Cached input $0.01 / 1M tokens; request input > 272,000 tokens: Input $0.40 / 1M tokens, Output $1.50 / 1M tokens, Cache write $0.50 / 1M tokens, Cached input $0.02 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold. Claude Haiku 5.5: request input ≤ 100,000 tokens: Input $0.06 / 1M tokens, Output $0.30 / 1M tokens, Cache write $0.075 / 1M tokens, Cached input $0.006 / 1M tokens; request input > 100,000 tokens: Input $0.30 / 1M tokens, Output $1.50 / 1M tokens, Cache write $0.375 / 1M tokens, Cached input $0.03 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold. Rates change; the /models page is the live source of truth.

### Is GPT-6.1 Terra or Claude Haiku 5.5 included in a Router One subscription?

Neither GPT-6.1 Terra nor Claude Haiku 5.5 is in a Router One plan, so every call to either bills the wallet per token.

### Can I switch between GPT-6.1 Terra and Claude Haiku 5.5 without changing code?

The API key and base URL stay the same, but this is not a one-string switch for every client or request. The model pages list GPT-6.1 Terra on /v1/responses and /v1/chat/completions, and Router One serves Claude Haiku 5.5 on /v1/messages and /v1/chat/completions, so Codex CLI (/v1/responses) runs only the GPT side and Claude Code (/v1/messages) only the Claude side. Per OpenAI's GPT-6 guide (checked 2026-10-28), GPT-6.1 Terra takes tool calls only on the Responses API and, at any reasoning effort other than none, no temperature, top_p or logprobs settings; per Anthropic's Claude Haiku 5.5 migration guide (checked 2026-10-10), Claude Haiku 5.5 returns a 400 for sampling settings it does not accept (omit temperature, top_p and top_k) and for an assistant prefill as the last turn. As of the 2026-10-28 plan response, both models are in no plan tier and bill the wallet per token.

### Where do these numbers come from?

Specs and prices on this page render from the live Router One catalog — the same data as the /models page — and refresh with it. Pricing methodology is documented on /pricing-methodology. Rates on this page were read from the live catalog on 2026-10-29 (UTC) and refresh within the hour.

## More comparisons

- [GPT-6.1 Terra vs DeepSeek V4.1 Flash](https://router.one/models/compare/gpt-6-1-terra-vs-deepseek-v4-1-flash)
- [Claude Haiku 5.5 vs Claude Haiku 4.5](https://router.one/models/compare/claude-haiku-5-5-vs-claude-haiku-4-5)
- [Claude Haiku 5.5 vs Gemini 3.5 Flash Lite](https://router.one/models/compare/claude-haiku-5-5-vs-gemini-3-5-flash-lite)
- [Claude Haiku 5.5 vs Claude Sonnet 5.5](https://router.one/models/compare/claude-haiku-5-5-vs-claude-sonnet-5-5)

## See also

- Canonical page: https://router.one/models/compare/gpt-6-1-terra-vs-claude-haiku-5-5
- All model comparisons: https://router.one/models/compare
- All models & prices: https://router.one/models (markdown: https://router.one/models.md)
- Pricing: https://router.one/pricing
- GPT API access: https://router.one/cheap-gpt-api
- Claude API access: https://router.one/cheap-claude-api
- GPT-6.1 Terra API guide: https://router.one/blog/gpt-6-1-terra-api-guide
- Claude Haiku 5.5 API guide: https://router.one/blog/claude-haiku-5-5-api-guide
- Cost calculator: https://router.one/llm-cost-calculator
- Pricing methodology: https://router.one/pricing-methodology