AI Model Comparison
Side-by-side comparison of pricing, context window, benchmarks, capabilities, and license. Every figure comes from the developer's own pages, last checked on ; each model's page lists its sources. A figure we could not source shows as a dash.
Model A — Z.ai (Zhipu AI)
GLM-5.3 is Z.ai's flagship model for coding and agent work, built on the same base model as GLM-5.2 with all gains from post-training. It accepts text only, with a 1M-token context window and up to 128K output tokens, and always reasons.
Model B — Upstage
Solar Pro 4 is Upstage’s flagship model, released on August 6, 2026, built for agentic use and document-based work, coding and business tasks. It supports a 512K context, up to 128K output tokens and a reasoning mode. It is available through Upstage’s console and on-premises.
| Property | GLM-5.3 | Solar Pro 4 |
|---|---|---|
| Released | Aug 18, 2026 | Aug 6, 2026 |
| Developer | Z.ai (Zhipu AI) | Upstage |
| Type | llm | llm |
| License | open-weight | proprietary |
| Context window | — | — |
| Parameters | — | — |
| Developer status | — | — |
| Input $/M tokens | $1.40 | $0.15 |
| Output $/M tokens | $4.40 | $0.60 |
Bold green values indicate the winner on that dimension where comparison is meaningful (lower price wins; bigger context wins; more open license wins; newer date wins). Prices are the ones each developer lists today; a model it no longer prices has none.
No exclusive capabilities
Programmatic access available at /api/ai/compare?a=glm-5-3&b=solar-pro-4. CORS is open. Citation guidance: /about/editorial-process.