GLM-5.3 API pricing undercuts competitors
Chinese startup z.ai's new language model GLM-5.3 stands out with its competitive pricing.
1GLM-5.3 API launched
Chinese startup z.ai has released its GLM-5.3 language model with advanced cyber capabilities. The API is now available, allowing developers to integrate it into their applications. Subscribers to the GLM Coding Plan currently have access only to the OpenAI Chat Completions-compatible protocol. While the model's weights are planned to be open-sourced, the exact timeline and licensing details remain unclear.
2Pricing details
GLM-5.3's API pricing remains unchanged from its predecessor GLM-5.2. Input tokens are priced at $1.40 per million, while output tokens cost $4.40 per million. Cached input comes at $0.26 per million tokens, with cache storage being offered free for a limited time. These prices show z.ai hasn't increased per-token costs for the new generation model.
3Competitive pricing advantage
GLM-5.3 offers significant value compared to other high-end models in the market. The total cost for one million input and one million output tokens is $5.80, compared to $8 for Grok 4.6, $18 for Kimi K3, $30 for Claude Opus 5, and $35 for GPT-5.6 Sol. This comparison highlights GLM-5.3's cost-effectiveness in the frontier model category.
4Industry competitors
Google's Gemini 3.7 Flash is priced at $0.75 per million input tokens and $3.75 per million output tokens until December 31, 2026. OpenAI's GPT-5.6 Luna costs $0.20 for input and $1.20 for output tokens. Xiaomi's MiMo-V2.5 Flash emerges as one of the most affordable options at $0.10 input and $0.30 output pricing.
5Performance evaluation
Independent evaluator Artificial Analysis scored GLM-5.3 at 60 on its Intelligence Index, tying it with Kimi K3 as the world's top open-weights model. This score represents a 7-point improvement over GLM-5.2. However, the model's more verbose responses increase per-task costs to $0.68 compared to GLM-5.2's $0.44, despite identical API token prices.
6Developer opportunities
GLM-5.3 API access provides developers with a cost-effective option for high-end coding and agent workloads. Maintaining the same price point as GLM-5.2 means teams can upgrade without additional costs. This model presents an attractive alternative for startups, particularly for long-term projects where cost efficiency matters.
7Industry trends
Price competition in the language model market is intensifying. Companies are using limited-time promotions to attract customers. Xiaomi's DeepSeek-V4-Flash offers off-peak pricing at $0.22 input and $0.66 output, while LongCat-2.0's standard pricing is $0.75 input and $2.95 output. In this competitive landscape, z.ai's stable pricing strategy stands out.
8Future outlook
The planned open-sourcing of GLM-5.3 could significantly increase its adoption rate by making it available for community development. However, clarifying licensing terms remains crucial. Continued cost reductions in the AI market will make these technologies more accessible to startups and smaller developers.
Original article: VentureBeat — GLM-5.3 API fiyatlarıyla rakiplerinin önüne geçti