| Claude Opus 5.5 | GPT-5.4 Nano | |
|---|---|---|
| Input, per 1M tokens | $4.00 | $0.20 |
| Output, per 1M tokens | $20.00 | $1.25 |
| Context window | 1M | 400K |
| Classification or routing (600 tokens in, 10 out), per 1,000 | $2.60 | $0.133 |
| Chat reply (2,000 in, 400 out), per 1,000 | $16.00 | $0.90 |
| Retrieval-augmented answer (8,000 in, 500 out), per 1,000 | $42.00 | $2.23 |
| Confidence signal | no | no |
| Tool calling | yes | yes |
| BANKING77, correct of 400 | 354 | not measured |
Which one should carry your traffic?
If GPT-5.4 Nano answers your requests as well as Claude Opus 5.5, moving that traffic saves 94% on chat-shaped requests. Averages cannot tell you whether it does for your requests. GPT-5.4 Nano does not expose a confidence signal through OpenRouter, so Gimbix would test it as a full replacement rather than a first answer.
Claude Opus 5.5 profile · GPT-5.4 Nano profile · Measure it on your traffic