Claude Opus 4.8 vs GPT-5.5
Claude Opus 4.8 vs GPT-5.5: Side-by-side API pricing and specs — call both with one OpenAI-compatible key on GetModel.
Claude Opus 4.8
Anthropic · Text
Claude Opus 4.8 is Anthropic's flagship model for complex reasoning, agentic workflows and coding. On getmodel it runs through a stable Claude Code Max pool or a low-cost Kiro pool, over both Anthropic-native and OpenAI-compatible endpoints.
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GPT-5.5
OpenAI · Text
OpenAI GPT-5.5 flagship model with strong all-round reasoning, writing and coding. Served through getmodel's stable Codex Pro pool over an OpenAI-compatible endpoint.
View details →Pricing comparison
| Claude Opus 4.8 | GPT-5.5 | |
|---|---|---|
| Input / 1M tokens | $0.442 | $0.309 Cheaper |
| Output / 1M tokens | $2.21 | $1.86 Cheaper |
Specifications
| Provider | Anthropic | OpenAI |
| Type | Text | Text |
| Endpoints | anthropic / openai | openai |
How to call
One API key calls both models — just change the "model" field.
from openai import OpenAI
client = OpenAI(base_url="https://getmodel.ai/v1", api_key="$GETMODEL_API_KEY")
# Claude Opus 4.8
client.chat.completions.create(model="claude-opus-4-8", messages=[{"role":"user","content":"Hi"}])
# GPT-5.5 (same key, just change "model")
client.chat.completions.create(model="gpt-5.5", messages=[{"role":"user","content":"Hi"}])