Claude Opus 5 vs Claude Sonnet 5.5
Claude Opus 5 (Anthropic) versus Claude Sonnet 5.5 (Anthropic): API pricing, context window, capabilities and uptime, from the same data as each model page, at the SoleAPI default channel price. Input costs 3.25 Credits / M for Claude Opus 5 and 3 Credits / M for Claude Sonnet 5.5, so Claude Sonnet 5.5 is 8% cheaper. Context windows are 1M and 1M.
Specs side by side
| Item | Claude Opus 5claude-opus-5 | Claude Sonnet 5.5claude-sonnet-5-5 |
|---|---|---|
| Input (prompt) · Credits / M | 3.25≈ $0.49 | 3≈ $0.452 |
| Output (completion) · Credits / M | 16.25≈ $2.45 | 15≈ $2.26 |
| Cache read · Credits / M | 0.325 | 0.3 |
| Context window | 1M | 1M |
| Max output | 128K | 128K |
| 7-day uptime | 100.0% | — |
| Latest probe latency | 2.65 s | — |
| Measured throughput | 58.7 t/s | 83.2 t/s |
| Protocols | Anthropic Messages / Gemini generateContent / OpenAI Responses | Anthropic Messages / OpenAI Responses |
| Sample monthly cost (10M in + 2M out) | 65≈ $9.79 | 60≈ $9.04 |
Prices are the SoleAPI default channel price in Credits (1 Credit = ¥1); green marks the better side. Uptime and latency come from SoleAPI probes; a dash means the model is not probed yet.
Capabilities
FAQ
Which is cheaper, Claude Opus 5 or Claude Sonnet 5.5?
At the SoleAPI default channel price, Claude Opus 5 input costs 3.25 Credits / M and Claude Sonnet 5.5 input costs 3 Credits / M, so Claude Sonnet 5.5 is 8% cheaper. Output and cache prices are in the specs table above.
Which has the larger context window, Claude Opus 5 or Claude Sonnet 5.5?
Claude Opus 5 offers 1M tokens, Claude Sonnet 5.5 offers 1M tokens.
Can I switch between Claude Opus 5 and Claude Sonnet 5.5 at any time?
Yes. SoleAPI calls every model with the same API key; switching is just changing the model field in the request, and billing is split per model in one console.
How do the capabilities of Claude Opus 5 and Claude Sonnet 5.5 differ?
Their capability flags are identical. Every other capability is either supported by both or by neither; see the capability table above.
More comparisons
One API key for both Claude Opus 5 and Claude Sonnet 5.5
Free credits on sign-up, pay as you go, no monthly fee.