GPT-6.1 Terra vs Claude Sonnet 5.5 — LLM API Cost Comparison
Compare GPT-6.1 Terra (OpenAI) vs Claude Sonnet 5.5 (Anthropic) on cost per million tokens, context window, and monthly spend.
Pricing data updated 2026-11-02 · Pricing may change — use the calculator for current estimates
- Input
- $1/1M tokens
- Output
- $5/1M tokens
- Context
- 1M tokens
- Released
- 2026-10
Auto-added 2026-11; set isCurrent: true after review
- Input
- $2/1M tokens
- Output
- $10/1M tokens
- Context
- 1M tokens
- Released
- 2026-09
Auto-added 2026-11; set isCurrent: true after review
Monthly Cost by Usage Tier (70% input / 30% output ratio)
| Usage | GPT-6.1 Terra | Claude Sonnet 5.5 | Cheaper by |
|---|---|---|---|
| Light (1M tokens) | $2.20 | $4.40 | GPT-6.1 Terra (50%) |
| Moderate (10M tokens) | $22.00 | $44.00 | GPT-6.1 Terra (50%) |
| Heavy (100M tokens) | $220 | $440 | GPT-6.1 Terra (50%) |
| Very Heavy (1B tokens) | $2,200 | $4,400 | GPT-6.1 Terra (50%) |
Frequently Asked Questions
Which is cheaper — GPT-6.1 Terra or Claude Sonnet 5.5?
For input tokens, GPT-6.1 Terra is cheaper at $1/1M tokens (2.0x lower). For output tokens, GPT-6.1 Terra is cheaper at $5/1M tokens. Total cost depends on the input and output mix.
What is the context window difference between GPT-6.1 Terra and Claude Sonnet 5.5?
GPT-6.1 Terra supports 1,050,000 tokens per request; Claude Sonnet 5.5 supports 1,000,000 tokens. GPT-6.1 Terra has the longer listed context window.
When should I choose GPT-6.1 Terra over Claude Sonnet 5.5?
Choose GPT-6.1 Terra (OpenAI) if you prefer OpenAI's ecosystem, tooling, or reliability track record. Auto-added 2026-11; set isCurrent: true after review. Choose Claude Sonnet 5.5 (Anthropic) if Auto-added 2026-11; set isCurrent: true after review. the price/performance fits your workload better. Use this calculator to find the break-even point for your exact token volume.
How much does 1 billion tokens cost on GPT-6.1 Terra vs Claude Sonnet 5.5?
At 700M input + 300M output tokens (1B total): GPT-6.1 Terra costs $2200; Claude Sonnet 5.5 costs $4400. The difference is $2200/billion tokens at this 70/30 input/output ratio.