The Two Premium Flagships
Claude (Anthropic) and GPT (OpenAI) are the two models most teams weigh for high-stakes work. They're close in raw capability; the differences that matter are judgment, ecosystem, and price. Both are on LinkModel under one key, so you can A/B them on your own prompts.
Price (flagship tier, per 1M tokens)
| Claude Opus 4.8 | GPT-5.5 | |
|---|---|---|
| Input | $5.00 | $5.00 |
| Output | $25.00 | $30.00 |
| Context | 1M | 1M |
| Batch | 50% off | 50% off |
| Caching | ~90% off cached | supported |
Input matches; GPT's output runs pricier. Both have cheaper tiers: Claude Sonnet 4.6 ($3/$15) and Haiku ($1/$5); GPT-5.4 ($2.50/$15), mini, and Nano ($0.20 input).
Where Claude Wins
- Judgment & instruction-following — Claude is known for nuance, honesty, and doing exactly what's asked without over-reaching.
- Agentic coding — an SWE-bench leader (Opus 4.7 ~87.6%), with a reputation for catching its own mistakes and fewer wasted iterations.
- Long-horizon reliability — strong at multi-step agent runs that must stay on-task.
Where GPT Wins
- Ecosystem & tooling — the most mature SDKs, structured output, and integrations.
- Native computer use & omnimodality — GPT-5.5 processes text, image, audio, and video end-to-end with native computer use.
- Codex line — GPT-5.3-codex is purpose-built for terminal/computer-use coding agents.
- A cheaper floor — the Nano tier ($0.20 input) has no direct Claude equivalent for ultra-cheap tasks.
Which Should You Use?
| Priority | Winner |
|---|---|
| Correctness & judgment | Claude |
| Agentic coding quality | Claude |
| Ecosystem / structured output | GPT |
| Computer use / omnimodal | GPT |
| Cheapest premium tasks | GPT (Nano) |
Honestly, both are excellent; the gap on most tasks is small. Many teams use both — Claude where judgment and coding quality matter, GPT where the ecosystem or computer-use fits — plus a cheap model for the bulk. See best coding LLM API and the four-way Claude vs GPT vs Gemini vs DeepSeek.
Test Both With One Change
# swap "claude-opus-4-8" ⇄ "gpt-5.5"
curl -X POST https://api.linkmodel.ai/api/v1/... \
-H "Authorization: Bearer $LINKMODEL_API_KEY" -H "Content-Type: application/json" \
-d '{ "model": "claude-opus-4-8", "messages": [{"role":"user","content":"Review this PR for correctness and edge cases: ..."}] }'Both share one chat request shape on LinkModel (up to 30% below official). Pricing detail in the Claude Opus guide and GPT API pricing.
Bottom Line
Claude for judgment and coding correctness; GPT for ecosystem, computer use, and a cheaper floor. Test both on your real prompts — the winner is workload-specific.
Start free with a $1 credit and run the same prompt on each.