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Data verified: Oct 27, 2026, 9:28 AM UTC · Prices sourced from official provider pages. Verify current rates before production use.
Data verified: Oct 27, 2026, 9:28 AM UTC · Prices sourced from official provider pages. Verify current rates before production use.
Price, context and performance head to head. Data synced from the provider catalog.
Cheaper
GLM 5
Larger context
GPT-5.5 Pro
Faster
GLM 5
Higher quality
GPT-5.5 Pro
| Feature | GLM 5 | GPT-5.5 Pro |
|---|---|---|
| Provider | Z.AI | OpenAI |
| Tier | Mid-tier | Flagship |
| Input per 1M tokens | $1 | $30 |
| Output per 1M tokens | $3.2 | $180 |
| Cached input per 1M | $0.2 | $30 |
| Context window | 204.8K | 1.1M |
| Intelligence index | 28/100 | — |
| Coding index | — | — |
| Agentic index | — | — |
| GPQA Diamond | 0.78 | — |
| Tau-bench (airline) | 0.76 | — |
| Speed | Standard | Slow |
| Vision (image input) | No | Yes |
| Function calling | Yes | Yes |
| Batch API | No | No |
Enter how many requests per day you send with an average prompt (1K input + 1K output) and compare the monthly cost of both models.
GLM 5 saves $617/mo vs GPT-5.5 Pro
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We integrate GLM 5 or GPT-5.5 Pro into your product with caching, observability and continuous evaluation — typically 40-80% cheaper than the obvious first pick.
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