Compare · ModelsLive · 2 picked · head to head
GPT-5 Chat vs o3
Side by side · benchmarks, pricing, and signals you can act on.
Winner summary
GPT-5 Chat wins on 4/6 benchmarks
GPT-5 Chat wins 4 of 6 shared benchmarks. Leads in coding · knowledge · language.
Category leads
coding·GPT-5 Chatknowledge·GPT-5 Chatlanguage·GPT-5 Chatmath·o3reasoning·o3
Hype vs Reality
Attention vs performance
GPT-5 Chat
#1 by perf·#1 by attention
o3
#67 by perf·no signal
Best value
GPT-5 Chat
1.3x better value than o3
GPT-5 Chat
14.6 pts/$
$5.63/M
o3
11.0 pts/$
$5.00/M
Vendor risk
Who is behind the model
OpenAI
$840.0B·Tier 1
OpenAI
$840.0B·Tier 1
Head to head
6 benchmarks · 2 models
GPT-5 Chato3
Aider polyglot
GPT-5 Chat leads by +6.7
Aider Polyglot · measures how well AI models can edit code across multiple programming languages using the Aider coding assistant framework.
GPT-5 Chat
88.0
o3
81.3
HELM · GPQA
GPT-5 Chat leads by +3.8
GPT-5 Chat
79.1
o3
75.3
HELM · IFEval
GPT-5 Chat leads by +0.6
GPT-5 Chat
87.5
o3
86.9
HELM · MMLU-Pro
GPT-5 Chat leads by +0.4
GPT-5 Chat
86.3
o3
85.9
HELM · Omni-MATH
o3 leads by +6.7
GPT-5 Chat
64.7
o3
71.4
HELM · WildBench
o3 leads by +0.4
GPT-5 Chat
85.7
o3
86.1
Full benchmark table
| Benchmark | GPT-5 Chat | o3 |
|---|---|---|
Aider polyglot Aider Polyglot · measures how well AI models can edit code across multiple programming languages using the Aider coding assistant framework. | 88.0 | 81.3 |
HELM · GPQA | 79.1 | 75.3 |
HELM · IFEval | 87.5 | 86.9 |
HELM · MMLU-Pro | 86.3 | 85.9 |
HELM · Omni-MATH | 64.7 | 71.4 |
HELM · WildBench | 85.7 | 86.1 |
Pricing · per 1M tokens · projected $/mo at 10M tokens
| Model | Input | Output | Context | Projected $/mo |
|---|---|---|---|---|
| GPT-5 Chat | $1.25 | $10.00 | 128K tokens (~64 books) | $34.38 |
| o3 | $2.00 | $8.00 | 200K tokens (~100 books) | $35.00 |