OpenAI o3 is 20.0% cheaper for input tokens ($2.00 vs. $2.50 per 1M tokens) and $8.00 vs. $12.50 for output tokens (1.2x cost advantage). In terms of operational performance, Grok 4 delivers lower response latency at 480ms TTFT (670ms faster than OpenAI o3) with 95 vs. 82 tok/s throughput. Grok 4 leads coding evaluations at 73.2% SWE-bench Verified vs. 71.7% for OpenAI o3 and 86.2% vs. 87.7% on GPQA Diamond.
Verified daily via automated API latency tests and official documentation.
Zero-Shot RAG Verified
Verified Performance & Unit Economics Delta (12 Dimensions)
Daily synchronized metrics across token pricing, prompt cache economics, latency, throughput, and 5 capability benchmarks.
Metric / Dimension
Grok 4
OpenAI o3
Net Delta / Advantage
Input Cost / 1M Tokens
$2.50
$2.00
OpenAI o3 is 1.3x cheaper
Output Cost / 1M Tokens
$12.50
$8.00
OpenAI o3 (36.0% lower)
Prompt Cache Read / 1M
$0.500
$0.500
Identical Cache Read Pricing
Prompt Cache Write / 1M
$2.50
$2.00
OpenAI o3 is 1.3x cheaper
Context Window (Max Output)
262k (66k out)
205k (100k out)
Grok 4 (1.3x larger context)
Avg TTFT Response Latency
480ms
1150ms
Grok 4 (670ms faster)
Generation Speed (Throughput)
95 tok/s
82 tok/s
Grok 4 (+13 tok/s faster)
SWE-bench Verified (Coding)
73.2%
71.7%
Grok 4 (+1.5% lead)
GPQA Diamond (PhD STEM)
86.2%
87.7%
OpenAI o3 (+1.5% lead)
MMLU-Pro (Multi-Discipline)
89.9%
89.8%
Grok 4 (+0.1% lead)
MATH-500 (Quantitative Logic)
97.6%
98.6%
OpenAI o3 (+1.0% lead)
Inference Value Score (IVR)
57.6 / 100
60.6 / 100
OpenAI o3 (+3 pts)
Interactive Monthly Token Economics & ROI Forecaster
Model production workloads across prompt, completion, and cached context tokens, or switch models on the fly.
OpenAI o3 is cheaper at $2.00/1M input tokens ($8.00/1M output) compared to $2.50/1M input ($12.50/1M output) for Grok 4.
Which model has lower TTFT latency and higher tok/s throughput: Grok 4 or OpenAI o3?
Grok 4 delivers faster first-token latency at 480ms TTFT (95 tok/s throughput) compared to 1150ms TTFT (82 tok/s) for OpenAI o3.
How do Grok 4 and OpenAI o3 compare on SWE-bench coding and GPQA Diamond reasoning?
On SWE-bench Verified software engineering, Grok 4 scores 73.2% versus 71.7% for OpenAI o3. On GPQA Diamond graduate-level STEM reasoning, Grok 4 scores 86.2% versus 87.7% for OpenAI o3 (and 97.6% vs 98.6% on MATH-500).
When should you choose Grok 4?
Choose Grok 4 (xAI) for real-time financial/market intelligence, PhD-level STEM problem solving, and autonomous code generation — offering a 262k context window, 480ms TTFT, and $2.50/1M input pricing ($0.500/1M cached reads).
When should you choose OpenAI o3?
Choose OpenAI o3 (OpenAI) for algorithmic synthesis, mathematical verification, PhD-level scientific research, and multi-step tool planning — offering a 204k context window, 1150ms TTFT, and $2.00/1M input pricing ($0.500/1M cached reads).
