Compare · ModelsLive · 2 picked · head to head

GLM 4.5 vs gpt-oss-120b (free)

Side by side · benchmarks, pricing, and signals you can act on.

Winner summary

gpt-oss-120b (free) wins 4 of 6 shared benchmarks. Leads in math · language · coding.

Category leads
math·gpt-oss-120b (free)knowledge·GLM 4.5language·gpt-oss-120b (free)coding·gpt-oss-120b (free)
Hype vs Reality
GLM 4.5
#23 by perf·no signal
QUIET
gpt-oss-120b (free)
#26 by perf·no signal
QUIET
Best value
GLM 4.5
49.4 pts/$
$1.40/M
gpt-oss-120b (free)
$0.00/M
Vendor risk
z-ai logo
z-ai
private · undisclosed
Unknown
OpenAI logo
OpenAI
$840.0B·Tier 1
Medium risk
Head to head
GLM 4.5gpt-oss-120b (free)
OpenCompass · AIME2025
gpt-oss-120b (free) leads by +7.6
GLM 4.5
85.8
gpt-oss-120b (free)
93.4
OpenCompass · GPQA-Diamond
GLM 4.5 leads by +0.6
GLM 4.5
79.5
gpt-oss-120b (free)
78.9
OpenCompass · HLE
gpt-oss-120b (free) leads by +1.4
GLM 4.5
16.9
gpt-oss-120b (free)
18.3
OpenCompass · IFEval
gpt-oss-120b (free) leads by +4.8
GLM 4.5
85.4
gpt-oss-120b (free)
90.2
OpenCompass · LiveCodeBenchV6
gpt-oss-120b (free) leads by +13.4
GLM 4.5
65.0
gpt-oss-120b (free)
78.4
OpenCompass · MMLU-Pro
GLM 4.5 leads by +3.0
GLM 4.5
82.7
gpt-oss-120b (free)
79.7
Full benchmark table
BenchmarkGLM 4.5gpt-oss-120b (free)
OpenCompass · AIME2025
85.893.4
OpenCompass · GPQA-Diamond
79.578.9
OpenCompass · HLE
16.918.3
OpenCompass · IFEval
85.490.2
OpenCompass · LiveCodeBenchV6
65.078.4
OpenCompass · MMLU-Pro
82.779.7
Pricing · per 1M tokens · projected $/mo at 10M tokens
ModelInputOutputContextProjected $/mo
z-ai logoGLM 4.5$0.60$2.20131K tokens (~66 books)$10.00
OpenAI logogpt-oss-120b (free)$0.00$0.00131K tokens (~66 books)