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Fireworks AI vs Z.ai
Z.ai makes the GLM models and sells a cheap coding plan from mostly China-based servers. Fireworks hosts GLM among 400+ open models, with fine-tuning.
By The Subconscious Team · Updated
Fireworks AI vs Z.ai: key differences
Z.ai is the lab behind GLM, and its pitch is price. GLM-5.3 costs $1.40 in and $4.40 out, GLM-5.3-Flash costs $0.075 in and $0.25 out, and several older Flash models are free. The GLM Coding Plan starts at $18 a month with a quota Z.ai says equals 15 to 30x the fee at API rates, and an Anthropic-compatible endpoint lets Claude Code run on GLM. Fireworks is one of the hosts that serves GLM weights, which ship under MIT. It sells per-token access across 400+ models on a GPU stack that posts 167 to 174 tokens per second on DeepSeek V4 Pro.
Location and control separate them. Z.ai's servers sit mostly in China, adding 100 to 200ms from the US or Europe and raising data concerns for enterprises. Coding Plan quota also burns 2 to 3x faster on premium models during Beijing peak hours. Fireworks offers SOC 2, HIPAA and ISO, and lets teams fine-tune GLM with SFT, DPO or RL, then serve it at base price. For an individual developer running budget Claude Code sessions, Z.ai's flat plan is the cheaper path. For production traffic in a regulated company, Fireworks is.
What Fireworks AI and Z.ai do
Fireworks AI
Fireworks AI was founded in 2022 by former Meta PyTorch engineers led by CEO Lin Qiao, and it sells speed on open models. Its custom serving stack has posted 167 to 174 tokens per second on DeepSeek V4 Pro in third-party measurements, several times what most GPU peers hit on the same model. The catalog holds 400+ models across text, vision, audio and embeddings, served through an OpenAI-compatible API. In July 2026 it raised a $1.505B Series D at a $17.5B valuation, with a reported $1B+ run rate and 40T+ tokens a day.
Example models: DeepSeek V4 Pro, Kimi K3
Full Fireworks AI profileZ.ai
Z.AI is the international brand of Chinese lab Zhipu AI, maker of the GLM models. Its current flagship, GLM-5.3, shipped August 17, 2026 at $1.40 in and $4.40 out per million tokens, with cached input at $0.26. GLM-5.3-Flash costs $0.075 in and $0.25 out, and several older Flash models are priced at zero, a real free tier instead of trial credits. GLM-5, released in February 2026, is a 744B mixture-of-experts model under an MIT license, and at launch it ranked first among open-weight models on the Artificial Analysis index with a record-low hallucination score.
Example models: GLM-5.3, GLM-5.3-Flash
Full Z.ai profileShould you choose Fireworks AI or Z.ai?
Fireworks AI
Choose Fireworks AI for
- GLM for enterprises wary of China-based servers
- Fine-tuning GLM and serving it at base price
- Mixing GLM with DeepSeek, Kimi and other open models
Z.ai
Choose Z.ai for
- Budget agentic coding in Claude Code on a flat plan
- Free-tier experiments on older GLM Flash models
- Direct access to the newest GLM release from its maker
Fireworks AI vs Z.ai at a glance
| Attribute | Fireworks AI | Z.ai |
|---|---|---|
| Model access | Open weights | Open weights (MIT) |
| Flagship models | DeepSeek V4 Pro, Kimi K3 | GLM-5.3, GLM-5.3-Flash |
| Speed | 167–174 tok/s on DeepSeek V4 Pro | ~80 tok/s on GLM-5.3 |
| Price | Fine-tunes served at base price | $1.40 in, $4.40 out (GLM-5.3); free Flash tier |
| Customization | SFT, DPO, RFT; Training API | Open weights, no license limits |
| Deployment | Serverless, dedicated GPUs | API, GLM Coding Plan |
| Long context | Full 1M on DeepSeek V4 Pro | 1M (GLM-5.3) |
Frequently asked questions
What is the difference between Fireworks AI and Z.ai?
Z.ai makes the GLM models and sells a cheap coding plan from mostly China-based servers. Fireworks hosts GLM among 400+ open models, with fine-tuning.
When should I choose Fireworks AI over Z.ai?
GLM for enterprises wary of China-based servers; Fine-tuning GLM and serving it at base price; Mixing GLM with DeepSeek, Kimi and other open models.
When should I choose Z.ai over Fireworks AI?
Budget agentic coding in Claude Code on a flat plan; Free-tier experiments on older GLM Flash models; Direct access to the newest GLM release from its maker.
Is Fireworks AI or Z.ai cheaper?
Fireworks AI: Fine-tunes served at base price. Z.ai: $1.40 in, $4.40 out (GLM-5.3); free Flash tier. The cheaper choice depends on the model and workload.
Which has more context, Fireworks AI or Z.ai?
Fireworks AI: Full 1M on DeepSeek V4 Pro. Z.ai: 1M (GLM-5.3).
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