GPT-5vsGrok 3 Thinking
GPT-5 has a larger context window than Grok 3 Thinking (400K tokens vs 128K tokens).
| Spec | GPT-5 | Grok 3 Thinking |
|---|---|---|
| Input price | $1.25/M tokens | — |
| Output price | $10/M tokens | — |
| Context window | 400K tokens | 128K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | — |
| Released | Aug 2025 | Feb 2025 |
Our Verdict
GPT-5
Grok 3 ThinkingRunner-up
Not enough votes to call it. On the specs, GPT-5 has the edge: newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
GPT-5
Input
$1.25
Output
$10.00
Grok 3 Thinking
Input
—
Output
—
Where to run it
2 hosts
Grok 3 Thinking
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 9 Sep 2026.
Writing DNA
Style Comparison
Similarity
37%
Grok 3 Thinking uses 17.7x more bold
GPT-5
Grok 3 Thinking
65%Vocabulary46%
13wSentence Length19w
0.20Hedging1.11
0.2Bold3.3
4.6Lists2.6
0.00Emoji0.00
0.16Headings0.64
0.03Transitions0.25
Based on 16 + 6 text responses
Research
What we learned reading every model
FAQ
Common questions
Keep exploring
More comparisons
Grok 3 Thinking vs Ox AlphaNew provider
Grok 3 Thinking vs Llama 4 MaverickNew provider
Grok 3 Thinking vs Claude Opus 4New provider
Grok 3 Thinking vs Claude Opus 4.1New provider
GPT-5 vs OpenRouter Fusion · Quality (Jun 2026)New provider
Grok 3 Thinking vs Gemini 1.5 ProNew provider
GPT-5 vs Gemini 2.0 Flash ThinkingNew provider
Grok 3 Thinking vs Gemini 2.0 Pro ExperimentalNew provider