Pricing, context window, capabilities, and release date — pulled from each provider's public docs. Both are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.
Both models stream in parallel through your own AIgateway key. Tokens, latency, and cost update as they arrive.
| Claude Opus 4.5 anthropic/claude-opus-4.5 | Claude Sonnet 4.5 anthropic/claude-sonnet-4.5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Family | Claude 4 | Claude 4 |
| Modality | text | text |
| Context window | 200,000 tok | 200,000 tok |
| Max output | 32,000 tok | 8,192 tok |
| Released | 2026-05-22 | 2026-05-22 |
| Input price | $5.00 /1M | $3.00 /1M |
| Output price | $25.00 /1M | $15.00 /1M |
| Cache read | — | — |
| Tools | yes | yes |
| Streaming | yes | yes |
| Vision | yes | yes |
| JSON mode | yes | yes |
| Reasoning | yes | yes |
| Prompt caching | — | — |
Claude Opus 4.5 brings further reasoning, coding, and agentic improvements over Opus 4.1, with stronger tool use and tighter instruction following.
Claude Sonnet 4.5 is the best coding model to date, with significant improvements across the entire development lifecycle.
# pip install aigateway-py openai
# aigateway-py: sub-accounts, evals, replays, jobs, webhook verify.
# openai SDK: chat/embeddings/images/audio — drop-in compat per our SDK's own guidance.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# Try Claude Opus 4.5
client.chat.completions.create(
model="anthropic/claude-opus-4.5",
messages=[{"role":"user","content":"hello"}],
)
# Try Claude Sonnet 4.5 — same client, same key
client.chat.completions.create(
model="anthropic/claude-sonnet-4.5",
messages=[{"role":"user","content":"hello"}],
)