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 5 anthropic/claude-opus-5 | O3 openai/o3 | |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Family | Claude 4 | o-series |
| Modality | text | text |
| Context window | 1,000,000 tok | 200,000 tok |
| Max output | 128,000 tok | 100,000 tok |
| Released | 2026-07-24 | 2026-05-22 |
| Input price | $5.00 /1M | $2.00 /1M |
| Output price | $25.00 /1M | $8.00 /1M |
| Cache read | — | — |
| Tools | yes | — |
| Streaming | yes | yes |
| Vision | yes | — |
| JSON mode | yes | — |
| Reasoning | yes | — |
| Prompt caching | — | — |
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.
o3 is OpenAI’s general-purpose reasoning model, balancing strong analytical performance with reasonable latency and cost.
# 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 5
client.chat.completions.create(
model="anthropic/claude-opus-5",
messages=[{"role":"user","content":"hello"}],
)
# Try O3 — same client, same key
client.chat.completions.create(
model="openai/o3",
messages=[{"role":"user","content":"hello"}],
)