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 Haiku 4.5 delivers similar levels of coding performance at one-third the cost and more than twice the speed of larger models.
Claude Sonnet 5.5 offers the best combination of speed and intelligence, with adaptive thinking for coding, tool use, reasoning, and long-horizon work.
Source: each provider's published benchmarks. Higher is better. Run an eval to compare on your own data.
from openai import OpenAI
client = OpenAI(
base_url="https://api.aigateway.sh/v1",
api_key="sk-aig-...",
)
# Claude Haiku 4.5
client.chat.completions.create(
model="anthropic/claude-haiku-4.5",
messages=[{"role":"user","content":"hello"}],
)
# Claude Sonnet 5.5
client.chat.completions.create(
model="anthropic/claude-sonnet-5.5",
messages=[{"role":"user","content":"hello"}],
)