LOADING DATASHEET
GROUNDED IN REAL HUMAN CONVERSATIONSYOUR BENCH
GLM 5.3 Flash
◆ OPEN
by Zhipu
OPEN WEIGHTSLOCALCODING HELPFAST ANSWERSAGENTS
RANKED #24 OF 267 ASSISTANTS · OVERALL #38 OF 6,566 · VIBE SCORE 6.9 · 1,188 VOICES
A fast, open-weights AI model designed to help developers with coding tasks and agent workflows.
HAPPY9.6
221 mentions
SAD5.4
73 mentions
VIBE TRAJECTORY
26 weeks · 8,138 voices
AGING WELL
The crowd is warmer now than it was at the start.
HOW TO USE IT
Open weights. You can use a hosted service, or download it and run it yourself, free.
RUN IT ON YOUR OWN MACHINE
Open weights: download GLM 5.3 Flash once and it's yours. No subscription, no rate limits, works offline.
320B total parameters (18B active Mixture-of-Experts), a Q4 GGUF file is about 180 GB to 195 GB
- BARE MINIMUM
Mac Studio (M2/M3 Ultra, 192 GB Unified Memory)
192 GB UNIFIED MEMORY
~$3500 USEDToo large for standard consumer GPUs; runs Q4 quantization at ~12 tok/s with short context using CPU and unified memory
- SWEET SPOT
Workstation with 4x NVIDIA RTX 3090 (24 GB)
96 GB VRAM PLUS 256 GB SYSTEM RAM
~$3200 USEDQ4 MoE offloaded across 4 GPUs and system RAM via KTransformers or llama.cpp at ~22 tok/s
- FULL POWER
Server with 4x NVIDIA RTX 6000 Ada (48 GB)
192 GB VRAM
~$28000 NEWFP8 native precision fitting completely into VRAM via vLLM or SGLang at ~55 tok/s with full context
LEARN HOW TO SET IT UP
WILL MY BOX RUN GLM 5.3 FLASH?
The three cards above are researched picks. Search the machine you actually have — we only say yes if it should reply at a usable speed, not just load the weights and crawl.
HARDWARE PICKS & PRICES ARE RESEARCHED FROM THE LIVE WEB AND REFRESHED AUTOMATICALLY. TREAT THEM AS BALLPARK, NOT GOSPEL.
WHAT CAN YOU ACTUALLY DO WITH IT?
Everyday jobs on each of those rigs: how long GLM 5.3 Flash takes, and how good the crowd says it is at that kind of work.
| THE JOB | BARE MINIMUMMac Studio (M2/M3 Ultra, 192 GB Unified Memory) | SWEET SPOTWorkstation with 4x NVIDIA RTX 3090 (24 GB) | FULL POWERServer with 4x NVIDIA RTX 6000 Ada (48 GB) |
|---|---|---|---|
| Write an emaila paragraph or two, drafted from a one-line brief | ~42 S★★★★★ | ~23 S★★★★★ | ~9 S★★★★★ |
| Summarize a documenta long report boiled down to the points that matter | ~2.1 MIN★★★★★ | ~68 S★★★★★ | ~27 S★★★★★ |
| Build a websitea small landing page, markup and styles together | ~11 MIN★★★★★ | ~6.1 MIN★★★★★ | ~2.4 MIN★★★★★ |
| Build a backendan API with routes, storage and tests | ~35 MIN★★★★★ | ~19 MIN★★★★★ | ~7.6 MIN★★★★★ |
| Build a gamea playable browser game in one file | ~21 MIN★★★★★ | ~11 MIN★★★★★ | ~4.5 MIN★★★★★ |
STARS ARE THE COMMUNITY SCORE FOR THAT KIND OF WORK, DOCKED FOR HOW SQUASHED THE WEIGHTS GET AT EACH TIER. TIMES ARE COMPUTED FROM RESEARCHED SPEEDS. BALLPARK, NOT GOSPEL.
WHAT THE INTERNET SAYS
Users love GLM 5.3 Flash for its fast responses, strong agentic performance, and helpful coding support. However, some complain about occasional hallucinations, robotic writing, and higher costs compared to competing models.
915 POSTS · 273 COMMENTS · REDDIT · HACKER NEWS · GITHUB · LEMMY · BLUESKY · DEV.TO · BLOG
PEOPLE LOVE
- Popular for coding help (10 mentions)
- People feel it is worth the money (5 mentions)
- Answers come back fast (3 mentions)
PEOPLE COMPLAIN ABOUT
- Outages, errors, or limits get in the way (6 mentions)
- Refuses or lectures more than people like (6 mentions)
- Sometimes makes things up (3 mentions)
- Writing feels flat or robotic (2 mentions)
TOPIC BY TOPIC
- Help with codePEOPLE LOVE THIS
10 thumbs up · 1 thumbs down
- PriceMOSTLY POSITIVE
5 thumbs up · 4 thumbs down
- Working when you need itA SORE SPOT
2 thumbs up · 6 thumbs down
- Getting facts rightMIXED FEELINGS
3 thumbs up · 3 thumbs down
- Saying no too muchA SORE SPOT
0 thumbs up · 6 thumbs down
- SpeedPEOPLE LOVE THIS
3 thumbs up · 1 thumbs down
- WritingMIXED FEELINGS
2 thumbs up · 2 thumbs down
IN THEIR OWN WORDS
- FROM BLOG >
“GLM-5.3 Flash looks especially strong on agentic cost/performance : On Agent Arena , @arena reported GLM-5.3-Flash at 19 overall , 4 among open models , with +4.6% net improvement over 9K+ real-world sessions and a $0.12 median cost/task .”
- FROM REDDIT >
“But unusable for me as it's expensive.”
- FROM GITHUB >
“[Bug] ModelOpt FP4: islayerexcluded misses fused module names and model.-prefixed names — mixed-precision NVFP4 checkpoints crash at load (GLM-5.3-Flash).”
- FROM DEV.TO >
“GLM-5.3-Flash is a total blast when you kill its hallucinations.”
LOOKING FOR AN ALTERNATIVE?
Checked picks first: tags say why you would switch, stars say how fully each one stands in for GLM 5.3 Flash.
Gemini 3.7 Flash
Grok 4.6
Qwen3.8 27B> SOURCES (12)
- HACKER NEWS · 2026-08-26 · 760 UPVOTESGLM-5.3-Flash
GLM-5.3-Flash
- REDDIT · 2026-08-26 · 485 UPVOTESOx Alpha is GLM 5.3 Flash by zAI
Ox Alpha is GLM 5.3 Flash by zAI
- REDDIT · 2026-08-26 · 291 UPVOTESChina is becoming compute independent - excerpt from GLM 5.3 Flash blog
China is becoming compute independent - excerpt from GLM 5.3 Flash blog
- REDDIT · 2026-08-27 · 246 UPVOTESQwen3.8-Flash-Next now available in Unsloth!
Qwen3.8-Flash-Next now available in Unsloth!
- REDDIT · 2026-09-04 · 239 UPVOTESWe made GLM-5.3-Flash GGUFs run 3.3x faster locally!
We made GLM-5.3-Flash GGUFs run 3.3x faster locally!
- REDDIT · 2026-08-27 · 228 UPVOTESGLM-5.3 Flash Unsloth Dynamic GGUFs
GLM-5.3 Flash Unsloth Dynamic GGUFs
- REDDIT · 2026-08-26 · 204 UPVOTESGLM-5.3-Flash is out now!
GLM-5.3-Flash is out now!
- REDDIT · 2026-08-26 · 202 UPVOTESGLM-5.3-Flash: Frontier Intelligence, Flash Cost
GLM-5.3-Flash: Frontier Intelligence, Flash Cost
- REDDIT · 2026-09-02 · 173 UPVOTESNew Unsloth Release - much faster performance + new model support
New Unsloth Release - much faster performance + new model support
- REDDIT · 2026-08-26 · 159 UPVOTESGLM 5.3 Flash (Ox Alpha) benchmark comparisons
GLM 5.3 Flash (Ox Alpha) benchmark comparisons
- REDDIT · 2026-08-29 · 134 UPVOTESGLM-5.3-Flash all GGUFs + imatrix uploaded
GLM-5.3-Flash all GGUFs + imatrix uploaded
- HACKER NEWS · 2026-08-26 · 128 UPVOTESGLM-5.3-Flash Intelligence, Performance and Price Analysis
GLM-5.3-Flash Intelligence, Performance and Price Analysis