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 Open 2 is an open-weight hybrid-attention mixture-of-experts model from Upstage, released on July 22, 2026 for agentic use (office productivity, document-intensive work and coding), with official support for Korean, English and Japanese. Upstage’s closed-beta API for it ran from July 8 to August 12, 2026; the open weights remain available.
| Property | GLM-5.3 | Solar Open 2 (250B) |
|---|---|---|
| Released | Aug 18, 2026 | Jul 22, 2026 |
| Developer | Z.ai (Zhipu AI) | Upstage |
| Type | llm | llm |
| License | open-weight | open-weight |
| Context window | — | — |
| Parameters | — | 250B total, 15B active (Mixture of Experts) |
| Developer status | — | — |
| Input $/M tokens | $1.40 | — |
| Output $/M tokens | $4.40 | — |
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.
Programmatic access available at /api/ai/compare?a=glm-5-3&b=solar-open-2. CORS is open. Citation guidance: /about/editorial-process.