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Model vs model · live prices

GLM 5.3 Prime vs Claude Sonnet 5

Claude Sonnet 5 is 1.1× cheaper than GLM 5.3 Prime at a 3:1 input:output mix ($4 vs $4.30 per million tokens).
Per 1M tokensZ.ai: GLM 5.3 PrimeAnthropic: Claude Sonnet 5
Input$2.80$2
Output$8.80$10
Cached input$0.56$0.2
Blended 3:1$4.30$4
Context window1M1M
ReleasedSeptember 23, 2026June 30, 2026
Tools · reasoningTools · ReasoningTools · Reasoning

List prices from OpenRouter, refreshed hourly. Lower price and larger context highlighted.

What the same work costs on each

At list price, before batch or caching discounts.
WorkloadGLM 5.3 PrimeClaude Sonnet 5Difference
1,000 chat messages
1,000 input + 500 output tokens each
$7.20$7.00$0.20
1,000 RAG questions
8,000 input + 500 output tokens each
$26.80$21.00$5.80
100 coding-agent steps
30,000 input + 2,000 output tokens each, no caching
$10.16$8.00$2.16

Which one should you use?

Price is only half the decision: run both on a sample of your own prompts and compare quality, speed and failure rate. If Claude Sonnet 5 is good enough for a task, it saves $0.20 per thousand chat messages. A common setup is to route easy requests to the cheaper model and keep GLM 5.3 Prime for the hard ones.

Both are available behind one OpenAI-compatible key through OpenRouter or a reseller, so switching is a one-line change. See where credits cost least today and how to cut the token bill.

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Disclosure: this site is run by the team behind smaaart, one of the options compared. Tables are ranked by price only, from live quotes and published fees, including when smaaart isn't first. How we compare