GLM Flash
Low-cost, fast-tier GLM language model from Z.ai, used for coding and agent tasks.
HN commenters use it as a very cheap daily driver for coding and code review,12345 with several rating it close to or on par with Sonnet-class models.67The most common complaint is that it is slow,89101112 and some say it gets stuck in thinking loops or writes verbose, Claude-like output.13141516
Why people recommend it
Low cost · 3
Commenters repeatedly call it cheap and the best value for what it can do.
“It's dirt cheap especially relative to how capable it is.”
“Lately I've been using GLM 5.3 Flash (from Fireworks), and my spend is $1-$2 per day when I use it for coding”
Show 1 more
“I use GLM-5.3-Flash for almost everything (the subscription-subsidized pricing on a legacy Z.ai plan makes it the best value model by a wide margin)”
Daily driver · 3
Many use it as their main everyday model for a wide range of tasks.
“it’s been a pretty good daily workhorse. And you can’t beat the price.”
Show 1 more
“My second favorite model by now is GLM 5.3 flash which is very capable of day to day task.”
Coding quality · 3
Users report it producing solid code, sometimes one-shotting moderately complex tasks.
“glm-5.3-flash one-shotted it correctly. Luna max couldn't achieve parity even after 3 total attempts.”
“GLM 5.3-flash instead was up for it and the code wasn't bad at all.”
Show 1 more
“GLM 5.3 Flash is incredibly cheap and imho as good as or better than Sonnet.”
Review and verification · 3
It is used for PR review and spec checking, catching bugs other models write.
“We use GLM 5.3 flash in pr review and it catches all sorts of bugs Claudes write”
“perfectly capable of following my spec and then poking holes in the implementation”
Show 1 more
“Flash is plenty good for planning and reviewing, for my needs.”
Local open weights · 3
Commenters value that it is an open-weight model they can run locally.
“GLM 4.7 Flash is the main model I use locally for agentic coding work, it's pretty incredible.”
“It's the first local-ish model that feels capable enough to be a default model to me (and it's very cheap).”
Show 1 more
“I have been using a PR branch to run GLM 5.3 flash locally”
Reverse engineering · 3
Users find it good at reverse engineering and tracking down bug causes.
“5.3 Flash is closer to 5.5 Sonnet/6 Luna capabilities-wise, but still smart enough to implement the easy fixes”
“GLM-5.3-Flash which for this use case has been clearly better at finding suspected causes”
Show 1 more
Caveats and dissent
Slow speed · 3
Several users find it slow compared with alternatives such as Gemini Flash and DeepSeek Flash.
“Tasks that would normally cost $0.08 on DSV4-Flash have cost me $0.30+ on GLM-5.3-Flash.”
“I have both GLM & Gemini in a subscription and see no reason for choosing GLM 5.3 Flash.”
Show 1 more
“GLM 5.3-flash was also nice, but not too much better for how much slower it is.”
Loops and overthinking · 2
It sometimes gets stuck in thinking loops or overanalyzes simple requests.
“it’s been a pretty good daily workhorse. And you can’t beat the price.”
“I use GLM 5.3 Flash more than any other model and it has the same issues as Mimo.”
Verbose style · 2
Some dislike its verbosity and Claude-like phrasing.
“I use 5.3-flash a lot, in spite of feeling kind of gross about its language.”
“It's incredibly capable and cheap, even if it's very verbose and not the fastest.”
Plan limits · 2
Users on the Z.ai coding plan report hitting usage limits.
“It's dirt cheap especially relative to how capable it is.”
“compared to GLM-5.3-flash via ZAI's Coding Plan? Because that's what I use”
Below frontier · 3
Some say it trails frontier models and needs steering on harder tasks.
“why Luna is still more compelling than GLM-5.3-flash.”
Show 1 more
“It's incredibly capable and cheap, even if it's very verbose and not the fastest.”
Variable cost · 1
One user found tasks cost several times more than on DeepSeek V4 Flash.
“Tasks that would normally cost $0.08 on DSV4-Flash have cost me $0.30+ on GLM-5.3-Flash.”
Often compared with
1 moved from DeepSeek V4 Flash to GLM Flash
1 moved from GLM Flash to DeepSeek V4 Flash
1 moved from Qwen 3.8 to GLM FlashGLM7 comments mention both
1 moved from Claude to GLM Flash
1 moved from Muse Spark to GLM Flash
Who recommends it in their own words
Threads where it came up
- Ask HN: What default model do you use and why? 6 mentions
- Why isn't the industry freaking out about DeepSeek 4.1 Flash? 4 mentions
- Muse Spark Open 3 mentions
- GLM-5.3-Flash 3 mentions
- DeepSeek-v4.1-Flash-1017 2 mentions
- One month coding with GLM 5.3 Flash 2 mentions
Also written as GLM-5.3-Flash, GLM 4.7 Flash, GLM 5.3-flash, GLM Flash. Data: glm-flash.json. Quotes are verbatim; the verdict and theme labels are written by a model from these comments, and every clause links to its sources.
All comments 41
“GLM 5.3 Flash is incredibly cheap and imho as good as or better than Sonnet.”
“We use Mistral Large 4, GLM 5.3 Flash and DeepSeek v4.1 Flash 1017 through their API”
“I used Sol and GLM 5.3 Flash to produce a prototype of a tower defense game for myself, and it works just fine.”
“I use GLM 5.3 Flash more than any other model and it has the same issues as Mimo.”
“glm flash for implementation”
“it’s been a pretty good daily workhorse. And you can’t beat the price.”
“the rest can be happily done with deepseek or glm flash”
“We use GLM 5.3 flash in pr review and it catches all sorts of bugs Claudes write”
“GLM 5.3 Flash feels like a major step up from Qwen”
“I use 5.3-flash a lot, in spite of feeling kind of gross about its language.”
“GLM 5.3 Flash is an excellent daily driver.”
“I use GLM Flash mostly.”
“if you're VRAM constrained, take a look at GLM 5.3 Flash or Qwen 3.8 Flash Next”
“Lately I've been using GLM 5.3 Flash (from Fireworks), and my spend is $1-$2 per day when I use it for coding”
“I use glm-5.3-flash every day for a ludicrous 8.5USD/month and it's as good as DS 4.1 flash, if not better.”
“compared to GLM-5.3-flash via ZAI's Coding Plan? Because that's what I use”
“5.3 Flash is closer to 5.5 Sonnet/6 Luna capabilities-wise, but still smart enough to implement the easy fixes”
“I use GLM-5.3-Flash for almost everything (the subscription-subsidized pricing on a legacy Z.ai plan makes it the best value model by a wide margin)”
“Probably viable for day to day work, but he'll have more thoughts next month.”
“Flash is plenty good for planning and reviewing, for my needs.”
“I am using zcode with GLM5.3 flash from z.ai”
“I use DS4.1 Flash and GLM 5.3 Flash, pay peanuts per day and get more than acceptable results.”
“perfectly capable of following my spec and then poking holes in the implementation”
“GLM 5.3 Flash as the default task-vision model”
“sending image based pdf pages to glm flash 5.3, not sure how to address / test it properly”
“It's dirt cheap especially relative to how capable it is.”
“GLM-5.3-flash is my current daily runner for coding and reviews”
“GLM 5.3-flash was also nice, but not too much better for how much slower it is.”
“It's the first local-ish model that feels capable enough to be a default model to me (and it's very cheap).”
“It's incredibly capable and cheap, even if it's very verbose and not the fastest.”
“I'm using a lot of gpt-5.6-Luna and glm-5.3-flash.”
“Glm-5.3-flash for me. I like faster models because I stay involved all the way through.”
“I have been using a PR branch to run GLM 5.3 flash locally”
“I have been using glm 5.3 flash and it feels as good as opus 5.”
“glm-5.3-flash and gpt-5.6-sol both suggested the guy standing in the hallway”
“GLM-5.3-Flash which for this use case has been clearly better at finding suspected causes”
“GLM 5.3-flash instead was up for it and the code wasn't bad at all.”
“Qwen 3.8 and GLM 5.3 Flash daily”
“Tasks that would normally cost $0.08 on DSV4-Flash have cost me $0.30+ on GLM-5.3-Flash.”
“My second favorite model by now is GLM 5.3 flash which is very capable of day to day task.”
“I have both GLM & Gemini in a subscription and see no reason for choosing GLM 5.3 Flash.”