Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 2 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.
Claude Opus 5 is Anthropic's model for complex agentic coding and enterprise work, delivering intelligence close to Claude Fable 5 at half the price. It uses adaptive thinking to calibrate reasoning per task and supports a one million token context window at standard pricing.
Claude Sonnet 4.5 is the best coding model to date, with significant improvements across the entire development lifecycle.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# Claude Opus 5
client.chat.completions.create(
model="anthropic/claude-opus-5",
messages=[{"role":"user","content":"hello"}],
)
# Claude Sonnet 4.5
client.chat.completions.create(
model="anthropic/claude-sonnet-4.5",
messages=[{"role":"user","content":"hello"}],
)