claude-opus-4-5-20251101 API
Call claude-opus-4-5-20251101 through a single OpenAI-compatible endpoint — one key, no separate vendor account, no multi-provider wiring.
AnthropicChatReasoningCodingVisionPricing
Input$2.50 / 1M tokens (¥16.25)
Output$12.50 / 1M tokens (¥81.25)
Output multiplier×5.00
Context window200K tokens
Max output64K tokens
Prices are per 1M tokens in USD · ¥6.5 = $1 · Billed in CNY
Anthropic
Claude models are the usual pick for long-document reasoning and agentic coding. StarSeaAPI terminates the Anthropic Messages protocol natively, so Claude Code and other Anthropic-native clients work without a translation layer.
When to use it
At $2.50 per 1M input tokens it sits above the catalogue median of $0.69 — a capability-first choice. Best for coding agents and repository-scale edits. Every model here is reachable with the same API key, so trialling it against a stronger sibling costs one line of code.
Code
from openai import OpenAI
client = OpenAI(
base_url="https://starseaapi.com/v1",
api_key="sk-your-key"
)
r = client.chat.completions.create(
model="claude-opus-4-5-20251101",
messages=[{"role": "user", "content": "Explain prefix caching in one paragraph"}]
)
print(r.choices[0].message.content)Other models from this provider
| Models | Input $/M | Output $/M | Intelligence index | Coding index |
|---|---|---|---|---|
| claude-haiku-5-5 | $0.05 | $0.25 | — | — |
| claude-haiku-4-5-20251001 | $0.50 | $2.50 | — | — |
| claude-sonnet-5 | $1.00 | $5.00 | 38.2 | 71.5 |
| claude-sonnet-5-5 frontier | $1.00 | $5.00 | 56.0 | — |
| claude-sonnet-4-5-20250929 | $1.50 | $7.50 | — | — |
| claude-sonnet-4-6 | $1.50 | $7.50 | 24.7 | — |
| claude-opus-5-5 frontier | $2.00 | $10.00 | 57.6 | — |
| claude-opus-4-6 | $2.50 | $12.50 | 26.4 | — |
| claude-opus-4-7 | $2.50 | $12.50 | 40.7 | 73.6 |
| claude-opus-4-8 | $2.50 | $12.50 | 41.8 | 74.3 |
| claude-opus-5 | $2.50 | $12.50 | 50.8 | 78.0 |
| claude-fable-5 | $5.00 | $25.00 | 49.6 | 76.5 |
| claude-fable-5-1 | $5.00 | $25.00 | 53.4 | 81.6 |