Last updated Jun 21, 2026
GPT-5.5 vs Claude Opus 4.8
G
GPT-5.5
Claude Opus 4.8
Quick answer
GPT-5.5 is the better pick for breadth, web access, and ChatGPT ecosystem integrations. Claude Opus 4.8 leads on long-document reasoning, coding nuance, and transparency.
Current pricing
| Feature | GPT-5.5 | Claude Opus 4.8 |
|---|---|---|
| API input | $5 / 1M tokens | $5 / 1M tokens |
| API output | $30 / 1M tokens | $25 / 1M tokens |
| Chat subscription | $20 Plus / $200 Pro | $20 Pro / $100 Max 5x |
| Context window | 256K tokens | 200K tokens |
Core capabilities
| Feature | GPT-5.5 | Claude Opus 4.8 |
|---|---|---|
| General chat | Excellent | Excellent |
| Web browsing | Yes | No |
| Long documents | Very good | Excellent |
| Coding | Excellent | Excellent |
| Reasoning transparency | Limited | Excellent |
Limits
| Feature | GPT-5.5 | Claude Opus 4.8 |
|---|---|---|
| Vision | Yes | Yes |
| Tool use | Yes | Yes |
| Rate limits | Generous on Pro | Generous on Max |
Best for
| Feature | GPT-5.5 | Claude Opus 4.8 |
|---|---|---|
| Daily productivity | Excellent | Good |
| Research & writing | Good | Excellent |
| Coding agents | Excellent | Excellent |
| Ecosystem lock-in | ChatGPT/GPTs | Anthropic API |
Final verdict
Choose GPT-5.5 if you want web access, voice mode, and the ChatGPT app ecosystem. Choose Claude Opus 4.8 for long-context analysis, coding nuance, and clearer reasoning chains.
FAQ
Which has the larger context window?
GPT-5.5 supports 256K tokens; Claude Opus 4.8 supports 200K tokens.
Is either cheaper at scale?
Claude Opus 4.8 output is slightly cheaper ($25 vs $30 per million tokens), but total cost depends on typical output length.