Automated page. Written and translated automatically by AI and checked against the sources by software; no human editor. SI-IQ is an index built from public benchmark results, not an IQ test. How it works

How smart is GLM-5.3-Flash?

120 SI-IQ · 90% interval 117–124
Rank 39 of 80 ranked models · Plausible rank range 25–56

GLM-5.3-Flash is a model from Z.ai (Zhipu AI), released on Aug 20, 2026. Its SI-IQ is 120 (90% interval 117–124), estimated from 7 benchmark results by 2 independent evaluators. Its strongest area is Math and its weakest is Reasoning.

Facts

Developer: Z.ai (Zhipu AI)
Released: Aug 20, 2026
Access: Open weights (restricted licence)
Benchmarks used: 7 results from 2 evaluators
API price: $0.15 input / $0.50 output per 1M tokens (developer's price list, Oct 18, 2026)
Context window: 1,048,576 tokens

Ability by area (SI-IQ, 90% interval)

Every benchmark result we used

Each score is one value exactly as the source published it: for Epoch AI the best of its run settings, for OpenRouter the median hosting provider (the developer's own hosting when it ran the test). “Implied SI-IQ” is the ability that this single result points to; the overall SI-IQ is their precision-weighted average.

Benchmark	Area	Score	Implied SI-IQ	Evaluated by	As listed by the source	Retrieved	Source
Chess Puzzles	Reasoning	21.0%	113	Epoch AI	`glm-5.3-flash_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
Mystery Game Puzzles	Reasoning	8.0%	70	Epoch AI	`glm-5.3-flash_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
FrontierMath Tier 4	Math	17.1%	121	Epoch AI	`glm-5.3-flash_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
FrontierMath Tiers 1–3	Math	55.8%	122	Epoch AI	`glm-5.3-flash_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
OTIS Mock AIME 2024–2025	Math	93.9%	121	Epoch AI	`glm-5.3-flash_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
GPQA Diamond	Knowledge	90.2%	124	Epoch AI	`glm-5.3-flash_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
GPQA Diamond (OpenRouter run)	Knowledge	90.9%	132	OpenRouter	`z-ai/glm-5.3-flash` digitalocean · median over providers (1 of 1 rows)	Oct 18, 2026	OpenRouter benchmark datasets · data file
τ²-bench Airline (OpenRouter run)	Agents	76.2%	131	OpenRouter	`z-ai/glm-5.3-flash-20260826` Z.AI · first-party provider (1 of 34 rows)	Oct 18, 2026	OpenRouter benchmark datasets · data file

Human preference (Arena)

On the Arena leaderboard, where people vote between two anonymous answers, GLM-5.3-Flash has a rating of 1,474 (1,469–1,479) from 32,925 votes (published Oct 15, 2026). Human preference is a different measure from benchmark ability and is not part of SI-IQ. Arena (Hugging Face)

Models with similar SI-IQ

Model	SI-IQ
GPT-5.1OpenAI	120	GLM-5.3-Flash vs GPT-5.1
GLM-5.2Z.ai (Zhipu AI)	121	GLM-5.3-Flash vs GLM-5.2
GPT-5OpenAI	121	GLM-5.3-Flash vs GPT-5
Kimi K2.6Moonshot	121	GLM-5.3-Flash vs Kimi K2.6
Kimi K2.5Moonshot	119	GLM-5.3-Flash vs Kimi K2.5

Computed with SI-IQ method version 1.0.0. Read the full methodology

Data sources: Arena leaderboard dataset on Hugging Face (CC BY 4.0); Epoch AI, ‘Capabilities & benchmarking’ (CC BY 4.0); API list prices via LiteLLM's price table (MIT); each price links to the developer's pricing page; Source: OpenRouter (openrouter.ai), licensed under CC BY 4.0: reuse and republish with attribution to OpenRouter..