Same input price; GPT-6.1 Terra costs $3.13 less per 1M output tokens. Both take images, call tools and reason before answering. Only GPT-6.1 Terra can return JSON. Claude Sonnet 5.5 reads up to 1M tokens at once, GPT-6.1 Terra 1.05M. Both run on one withConflux key.
| Claude Sonnet 5.5 | GPT-6.1 Terra | |
|---|---|---|
| Input, per 1M tokens | $2.50 | $2.50 |
| Output, per 1M tokens | $12.50 | $9.38 |
| Context | 1M tokens | 1.05M tokens |
| Can use | vision, tools, reasoning | vision, tools, JSON, reasoning |
| Typical answer, our gateway | Not measured yet | Not measured yet |
| First token | Not measured yet | Not measured yet |
Green = better on that row. Speed for every model: API speed.
At your price on withConflux. Change the numbers in the calculator below to match your traffic.
| Workload | Claude Sonnet 5.5 | GPT-6.1 Terra |
|---|---|---|
| Support chatbot 30,000 messages a month, 1,500 tokens in and 300 out each | $225.00 | $196.88 |
| Coding agent 2,000 tasks a month, 40,000 tokens in and 4,000 out each | $300.00 | $275.00 |
| Document summaries 10,000 documents a month, 8,000 tokens in and 600 out each | $275.00 | $256.25 |
from openai import OpenAI client = OpenAI(base_url="https://withconflux.com/v1", api_key="cflx_live_...") client.chat.completions.create(model="gpt-6.1-terra", messages=[...]) # or "claude-sonnet-5-5"
Sign up free and call Claude Sonnet 5.5 and GPT-6.1 Terra with the same key. Each call shows its cost per key.
Input costs the same ($2.50 per 1M). Output is cheaper on GPT-6.1 Terra ($9.38 vs $12.50 per 1M), so it costs less for most chat and agent work.
On withConflux, yes: both are behind the same OpenAI-compatible endpoint. You change the model name.
No. One withConflux key calls both. With your own keys (BYOK) you can use your accounts instead, for €19 a month.
Prices are read from our live model list. Speed is recalculated every hour from the last 7 days. The date is on the page.