High-volume, cost-sensitive work
Either one
Both cost $2.00 per million tokens on a typical mix of three input tokens for every output token.
Claude Haiku 4.5 vs GPT-6.1 Terra: price, context and capabilities
Choose GPT-6.1 Terra for reused prompts and documents (RAG, agents), very long inputs and the latest release; on the other points the two are level or the data is missing.
In short
- Both cost the same at the headline price ($2.00 / 1M tokens).
- GPT-6.1 Terra reads more per request: 1.05M tokens against 200k.
- GPT-6.1 Terra is the newer model (Oct 26, 2026, against October 2025).
- Only Claude Haiku 4.5 offers batch api.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Reused prompts and documents (RAG, agents)
Choose GPT-6.1 Terra
GPT-6.1 Terra charges $0.05 per million cached input tokens, against $0.10 for Claude Haiku 4.5.
Very long inputs
Choose GPT-6.1 Terra
GPT-6.1 Terra reads up to 1.05M tokens per request, against 200k for Claude Haiku 4.5.
Latest release
Choose GPT-6.1 Terra
GPT-6.1 Terra is the newer release (Oct 26, 2026, against October 2025 for Claude Haiku 4.5).
Monthly cost at three volumes
| Volume | Claude Haiku 4.5 | GPT-6.1 Terra | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $2.25 | $2.25 | = |
| Production: 20M input, 5M output tokens | $45.00 | $45.00 | = |
| Scale: 500M input, 100M output tokens | $1,000 | $1,000 | = |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| Claude Haiku 4.5 | GPT-6.1 Terra | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Category | Language models | Language models |
| Status | Legacy | Generally available |
| Headline price | $2.00 / 1M tokens | $2.00 / 1M tokens |
| Input | $1.00 / 1M tokens | $1.00 / 1M tokens |
| Output | $5.00 / 1M tokens | $5.00 / 1M tokens |
| Cached input | $0.10 / 1M tokens | $0.05 / 1M tokens |
| Context window | 200k | 1.05M |
| Max output | 64k | 128k |
| Released | October 2025 | Oct 26, 2026 |
| Knowledge cutoff | No data | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching |
| API model id | claude-haiku-4-5-20251001 | gpt-6.1-terra |
Frequently asked questions
Should I choose Claude Haiku 4.5 or GPT-6.1 Terra?
Choose GPT-6.1 Terra for reused prompts and documents (RAG, agents), very long inputs and the latest release; on the other points the two are level or the data is missing.
Which is cheaper, Claude Haiku 4.5 or GPT-6.1 Terra?
Both cost the same at the headline price ($2.00 / 1M tokens).
Which has the larger context window, Claude Haiku 4.5 or GPT-6.1 Terra?
GPT-6.1 Terra reads more per request: 1.05M tokens against 200k.
What is the difference between Claude Haiku 4.5 and GPT-6.1 Terra?
Claude Haiku 4.5 is made by Anthropic and GPT-6.1 Terra by OpenAI. Both cost the same at the headline price ($2.00 / 1M tokens). GPT-6.1 Terra reads more per request: 1.05M tokens against 200k. GPT-6.1 Terra is the newer model (Oct 26, 2026, against October 2025). Only Claude Haiku 4.5 offers batch api.
How much do Claude Haiku 4.5 and GPT-6.1 Terra cost per month?
At 20 million input and 5 million output tokens a month, Claude Haiku 4.5 costs $45.00 and GPT-6.1 Terra costs $45.00, at standard rates.
Which is newer, Claude Haiku 4.5 or GPT-6.1 Terra?
GPT-6.1 Terra was released on Oct 26, 2026 and Claude Haiku 4.5 on October 2025.