GPT-5.5 vs Claude Opus 5

GPT-5.5 and Claude Opus 5 come from different camps — OpenAI versus Anthropic — and they split most sharply on price and context. GPT-5.5 runs at $5.00/$30.00 per 1M tokens with a 256K window; Claude Opus 5 sits at $5.00/$25.00 with 1M of context. Neither is objectively "better" — the right pick depends on what you're shipping.

In practice: OpenAI's current flagship model with frontier reasoning, coding, and multimodal capabilities. Anthropic's everyday frontier model. Opus 5 brings adaptive thinking on by default and five-level effort control at the same price as Opus 4.8. Both ship through AI API Hub on an OpenAI-compatible endpoint, so you can move between them by changing a single model name — and settle the bill with USDT or USDC, no credit card required.

On cost alone, Claude Opus 5 is the cheaper of the two (Same per 1M input), which adds up fast once real traffic hits. Use the calculator below to model your own volume.

→If your workload involves long document reasoning or multi-step instruction following → Claude Opus 5 performs better with its 1M context.

→If cost is your primary constraint → GPT-5.5 provides ~0% lower cost per 1M tokens.

→If you need function-calling AI agents → both support tool use; choose GPT-5.5 for higher-volume cost efficiency.

On performance, GPT-5.5 leans into frontier performance and pairs it with 256K of context — enough for frontier performance and best reasoning. Claude Opus 5 answers with near-frontier intelligence across 1M, which makes it the stronger fit when you need near-frontier intelligence and 1m context. The gap is real, but it's a question of fit rather than dominance.

Pricing is where they part ways. At $5.00/$30.00 versus $5.00/$25.00 per 1M tokens, they're neck and neck. Run a typical workload of 1M requests/month at ~1K input / 500 output tokens and Claude Opus 5 keeps roughly $2500.00/month in your pocket.

Our take: if cost efficiency drives the decision, GPT-5.5 wins. Either way, both run through AI API Hub with USDT/USDC payments and instant activation — start with $5 and one API key covers every model.

Since both GPT-5.5 and Claude Opus 5 are available through AI API Hub with OpenAI-compatible API format, switching between them requires only changing the model name parameter. Your existing SDK code works without modification.

from openai import OpenAI
client = OpenAI(api_key="YOUR_KEY", base_url="https://api.apiyihe.org/v1")
# Before: response = client.chat.completions.create(model="gpt-5.5", messages=[...])
# After:  response = client.chat.completions.create(model="claude-opus-5", messages=[...])

import OpenAI from "openai";
const client = new OpenAI({apiKey: process.env.KEY, baseURL: "https://api.apiyihe.org/v1"});
// Before: model: "gpt-5.5"
// After:  model: "claude-opus-5"

curl https://api.apiyihe.org/v1/chat/completions \
  -H "Authorization: Bearer YOUR_KEY" \
  -d '{"model": "claude-opus-5", "messages": [{"role":"user","content":"Hello"}]}'

💡 AI API Hub supports both models through one API key. No separate accounts needed. Pay with USDT/USDC for all models.