GLM-5.3vsSeed 2.1 Pro
Both language models, compared at each maker’s own API list prices. Every figure links to its source.
Compare at your usage
Every model priced for the same request8,000 tokens in, 2,000 out
| GLM-5.3 on Z.ai API | Seed 2.1 Pro on Volcengine Ark | |
|---|---|---|
| Rate applied | Base rate | Base rate |
| Inputper 1M tokens | $1.40 | ¥6.00 |
| Cache readper 1M tokens | $0.26 | ¥1.20 |
| Outputper 1M tokens | $4.40 | ¥30.00 |
| Cost per request | $0.020 | ¥0.108 |
| Per 1,000 requests | $20.00 | ¥108.00 |
Every model is priced for the same request at its maker’s own list prices (each with its source and date), so bold marks the cheapest. A model that can’t serve the request is named, not ranked; a condition its seller doesn’t price says which rate was used.
Key differences
These differences use verified vendor specifications or each maker’s official API on the same region, currency, meter and billing conditions. Different conditions remain side by side in the full table; they do not establish which model is cheaper. Declared features describe support, not measured quality or a recommendation. Missing evidence does not mean a feature is unsupported.
Full comparison
| GLM-5.3 Zhipu AI | Seed 2.1 Pro ByteDance Seed | |
|---|---|---|
| Overview | ||
| Released | Aug 18, 2026 | Sep 2026 |
| Open weights | — | |
| Specs | ||
| Context | 1M | 1.02M |
| Max output | 128K | 256K |
| Input modalities | Text | Text, Image |
| Output modalities | Text | Text |
| Reasoning | ||
| Reasoning efforts | low, high, max | low, medium, high, minimal |
| Reasoning can be off | — | |
| Tool use | ||
| Structured output | ||
| Pricing · per 1M tokens | ||
| Input price | $1.40 | ¥6.00 |
| Output price | $4.40 | ¥30.00 |
| Cache read price | $0.26 | ¥1.20 |
| Blended price (3 input : 1 output) | $2.15 | ¥12.00 |
| Pricing under conditions · per 1M tokens | ||
| Batch input price | Not offered | ¥3.00Batch |
| Batch output price | Not offered | ¥15.00Batch |
| Flex tier input price | Not offered | ¥3.00Flex tier |
| Flex tier output price | Not offered | ¥15.00Flex tier |
| Cited scores | ||
| Epoch Capabilities Index | 156.9 | — |
| LMArena Text | 1,481 max effort | — |
| LMArena Text · Coding | 1,520 max effort | — |
| LMArena Text · Chinese | 1,538 max effort | — |
| Epoch AI · GPQA Diamond | 90.9% max effort | — |
| Epoch AI · FrontierMath Tiers 1–3 | 68.8% max effort | — |
Headline prices may come from different channels, regions or tiers. Check each source before choosing a model; missing facts stay blank.
Model details and sources
- GLM-5.3 → Available
- Seed 2.1 Pro → Available
Cited scores
- Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · Epoch AI Benchmarking Hub data · CC BY 4.0 · as of Nov 5, 2026
- Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · Epoch AI Benchmarking Hub data · CC BY 4.0 · as of Oct 28, 2026
- Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · Epoch AI Benchmarking Hub data · CC BY 4.0 · as of Nov 4, 2026
- EQ-Bench by Samuel J. Paech (eqbench.com; EQ-bench/EQ-bench-site on GitHub), MIT License. · EQ-Bench: Longform Writing · MIT · as of Oct 28, 2026
- LiveBench (White et al.), release 2026-06-25, livebench.ai, licensed CC BY-SA 4.0. This board, adapted from it, is shared under CC BY-SA 4.0. · LiveBench release 2026-06-25 · CC BY-SA 4.0 · as of Jun 25, 2026
- LMArena (Arena), leaderboard-dataset on Hugging Face, licensed CC BY 4.0 · LMArena leaderboard dataset (Hugging Face) · CC BY 4.0 · as of Oct 28, 2026
- Terminal-Bench 4.0 leaderboard (Marten, Shaw et al., Terminal-Bench; harbor-framework/terminal-bench on GitHub), licensed Apache-2.0. · harbor-framework/terminal-bench leaderboard submissions · Apache-2.0 · as of Sep 29, 2026