Compare · ModelsLive · 2 picked · head to head
GLM 5.3 Flash vs gpt-oss-120b
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GLM 5.3 Flash wins on 14/14 benchmarks
GLM 5.3 Flash wins 14 of 14 shared benchmarks. Leads in speed · agentic · arena.
Category leads
speed·GLM 5.3 Flashagentic·GLM 5.3 Flasharena·GLM 5.3 Flashknowledge·GLM 5.3 Flashgeneral·GLM 5.3 Flashmath·GLM 5.3 Flash
Hype vs Reality
Attention vs performance
GLM 5.3 Flash
#151 by perf·#3 by attention
gpt-oss-120b
#140 by perf·no signal
Best value
GLM 5.3 Flash
6.2x better value than gpt-oss-120b
GLM 5.3 Flash
813.2 pts/$
$0.06/M
gpt-oss-120b
131.5 pts/$
$0.38/M
Vendor risk
Who is behind the model
z-ai
private · undisclosed
OpenAI
$840.0B·Tier 1
Head to head
14 benchmarks · 2 models
GLM 5.3 Flashgpt-oss-120b
Artificial Analysis · CritPt
GLM 5.3 Flash leads by +14.3
GLM 5.3 Flash
15.4
gpt-oss-120b
1.1
Artificial Analysis · GDPval
GLM 5.3 Flash leads by +51.8
GLM 5.3 Flash
57.2
gpt-oss-120b
5.4
Artificial Analysis · GPQA Diamond
GLM 5.3 Flash leads by +13.0
GLM 5.3 Flash
91.2
gpt-oss-120b
78.2
Artificial Analysis · Humanity's Last Exam
GLM 5.3 Flash leads by +20.3
GLM 5.3 Flash
39.9
gpt-oss-120b
19.6
Artificial Analysis · Long Context Reasoning
GLM 5.3 Flash leads by +28.0
GLM 5.3 Flash
80.0
gpt-oss-120b
52.0
Artificial Analysis · Quality Index
GLM 5.3 Flash leads by +30.2
GLM 5.3 Flash
41.8
gpt-oss-120b
11.6
Artificial Analysis · SciCode
GLM 5.3 Flash leads by +17.6
GLM 5.3 Flash
51.6
gpt-oss-120b
34.0
APEX-Agents
GLM 5.3 Flash leads by +48.1
APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments.
GLM 5.3 Flash
52.8
gpt-oss-120b
4.7
Chatbot Arena Elo · Overall
GLM 5.3 Flash leads by +121.4
GLM 5.3 Flash
1473.0
gpt-oss-120b
1351.6
Chess Puzzles
GLM 5.3 Flash leads by +1.1
Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities.
GLM 5.3 Flash
16.9
gpt-oss-120b
15.8
GPQA diamond
GLM 5.3 Flash leads by +22.8
Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs.
GLM 5.3 Flash
90.5
gpt-oss-120b
67.7
Mystery Game Puzzles
GLM 5.3 Flash
0.0
gpt-oss-120b
0.0
OTIS Mock AIME 2024-2025
GLM 5.3 Flash leads by +5.0
OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills.
GLM 5.3 Flash
93.9
gpt-oss-120b
88.9
Surface Evolver Bench
GLM 5.3 Flash leads by +27.5
GLM 5.3 Flash
52.5
gpt-oss-120b
25.0
Full benchmark table
| Benchmark | GLM 5.3 Flash | gpt-oss-120b |
|---|---|---|
Artificial Analysis · CritPt | 15.4 | 1.1 |
Artificial Analysis · GDPval | 57.2 | 5.4 |
Artificial Analysis · GPQA Diamond | 91.2 | 78.2 |
Artificial Analysis · Humanity's Last Exam | 39.9 | 19.6 |
Artificial Analysis · Long Context Reasoning | 80.0 | 52.0 |
Artificial Analysis · Quality Index | 41.8 | 11.6 |
Artificial Analysis · SciCode | 51.6 | 34.0 |
APEX-Agents APEX-Agents · evaluates AI agents on complex, multi-step tasks requiring planning, tool use, and autonomous decision-making in realistic environments. | 52.8 | 4.7 |
Chatbot Arena Elo · Overall | 1473.0 | 1351.6 |
Chess Puzzles Chess Puzzles · tests strategic and tactical reasoning by having models solve chess puzzle positions, evaluating lookahead and pattern recognition abilities. | 16.9 | 15.8 |
GPQA diamond Graduate-Level Google-Proof QA (Diamond set) · expert-crafted questions in physics, biology, and chemistry that are difficult even for domain PhDs. | 90.5 | 67.7 |
Mystery Game Puzzles | 0.0 | 0.0 |
OTIS Mock AIME 2024-2025 OTIS Mock AIME 2024-2025 · simulated American Invitational Mathematics Examination problems testing advanced problem-solving skills. | 93.9 | 88.9 |
Surface Evolver Bench | 52.5 | 25.0 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| $0.04 | $0.08 | 1.0M tokens (~524 books) | $0.50 | |
| $0.15 | $0.60 | 131K tokens (~66 books) | $2.62 |