Claude Opus 4.8vsGPT-5.5
Anthropic vs OpenAI
Overview
Anthropic's Claude Opus 4.8 and OpenAI's GPT-5.5 are the two most capable general-purpose AI models as of 2026, locked in fierce competition. Claude Opus 4.8 leads in coding (SWE-bench Pro 69.2), while GPT-5.5 excels at ARC-AGI-2 (85.0) — each with distinct strengths. On pricing, GPT-5.5 costs $2.5/1M tokens, half of Claude Opus 4.8's $5/1M tokens.
Specs & Pricing
| Claude Opus 4.8 | GPT-5.5 | |
|---|---|---|
| Developer | Anthropic | OpenAI |
| Type | foundation | foundation |
| Parameters | 非公開 | 非公開 |
| Context Window | 1M | — |
| Open Source | — | — |
| Input Price (/1M tokens) | $5 | $2.5 |
| Output Price (/1M tokens) | — | — |
Recommendations by Use Case
Which model fits your task best
Claude Opus 4.8's SWE-bench Pro score (69.2) significantly exceeds GPT-5.5 (58.6), giving it the edge in real-world software engineering tasks.
Both models tie at GPQA Diamond (93.6). Claude Opus 4.8 leads on HLE (57.9 vs 52.2), but GPT-5.5 dominates ARC-AGI-2 (85.0). Overall reasoning capability is neck-and-neck.
GPT-5.5 costs $2.5/1M input tokens — half of Claude Opus 4.8's $5. With comparable reasoning power, it offers clearly better cost-performance.
Claude Opus 4.8 supports a 1M-token context window, giving it the advantage for long-document processing and large codebase analysis.