# GLM-5.3-Flash now bills at $0.15/$0.50 after its 50% launch discount ended

GLM-5.3-Flash now bills at $0.15 input and $0.50 output per 1M tokens. The $0.075/$0.25 launch rate was a 50 percent promotion that ended on 9 September 2026. Full-size GLM-5.3 stays at $1.40/$4.40, and our verdict stays conditional.

By Neomanex. Updated 2026-09-27.

GLM-5.3-Flash bills at $0.15 per 1M input tokens and $0.50 per 1M output. The $0.075/$0.25 rate quoted at launch was a 50 percent promotion that ended at 24:00 UTC+8 on 9 September 2026, and Z.ai's pricing table no longer carries it. Full-size [GLM-5.3](/models/glm-5-3) is unchanged at $1.40/$4.40, and our verdict stays **conditional**: the Flash price moved, the trust question did not.

## What happened

When we read Z.ai's official pricing table on 9 September 2026, it listed GLM-5.3-Flash at $0.075 input and $0.25 output per million tokens, a 50 percent discount on the $0.15/$0.50 list rate ending 9 September 2026, 24:00 UTC+8. Read again on 14 September, the table shows Flash at its list rate with no discount note.

| Model | Input / 1M | Cached input / 1M | Output / 1M |
|---|---|---|---|
| GLM-5.3 | $1.40 | $0.26 | $4.40 |
| GLM-5.2 | $1.40 | $0.26 | $4.40 |
| GLM-5.1 | $1.40 | $0.26 | $4.40 |
| GLM-5 | $1.00 | $0.20 | $3.20 |
| GLM-5.3-Flash (list rate, current) | $0.15 | $0.03 | $0.50 |
| GLM-5.3-Flash (launch promo, ended 9 Sep 2026) | $0.075 | not recorded | $0.25 |

## Why it matters

Any Flash cost model built on $0.075/$0.25 is half the real bill. That is arithmetic, not a benchmark argument.

The full-size rate is the other fact worth reading twice: GLM-5.3 costs exactly what GLM-5.2 and GLM-5.1 cost. Z.ai built 5.3 through post-training on the [GLM-5.2](/models/glm-5-2) base and charged nothing extra for it.

### We got both halves wrong

We are reporting this against our own entry. [GLM-5.3](/models/glm-5-3) carried two defects:

- **The Flash promo was stored as a standing rate.** Our pricing context read "GLM-5.3-Flash $0.075/$0.25" with no sign it was time-limited or that a higher list rate sat behind it. The entry's pricing fields now show the $0.15/$0.50 list rate.
- **The standing verdict said pricing was unpublished.** The summary claimed "per-token pricing is unpublished" while the entity's own fields carried $1.40/$4.40, a rate [live since at least 20 August 2026](/news/glm-5-3-api-pricing). That summary is corrected when this post publishes.

The two defects share one cause: prose written at launch, never re-read against the fields beside it.

The rating holds at conditional because GLM-5.3's headline coding and cyber scores, including Terminal Bench 3.0 and CyberGym, come from Z.ai's own team; the third-party runs so far (Artificial Analysis, Proximal's FrontierSWE) do not cover them. A published price answers a transparency question, not a trust one.

## What changes for you

- Re-forecast every GLM-5.3-Flash workload at $0.15 input and $0.50 output per 1M tokens. If your number came from a launch write-up, double it.
- Budget full-size GLM-5.3 at $1.40 / $4.40 with $0.26 cached input. If you already priced GLM-5.2, nothing changes.
- Do not standardize on GLM-5.3's headline benchmark scores until someone outside Z.ai reproduces them.

## FAQ

**Is GLM-5.3-Flash still $0.075 per 1M input tokens?** No. That was a 50 percent launch promotion that ended at 24:00 UTC+8 on 9 September 2026. The list rate is $0.15 input and $0.50 output per 1M tokens.

**Did full-size GLM-5.3 get more expensive?** No. It is $1.40 input and $4.40 output per 1M tokens, the same as GLM-5.2. Only the Flash tier moved.

**Why is the verdict still conditional?** Because Z.ai's own team ran the headline coding and cyber benchmarks, and no pricing fact changes that.

Canonical: https://neomanex.com/news/glm-5-3-flash-launch-discount-ends