GPT-5.3 Codex vs Grok 3: Pricing Comparison
Compare pricing, capabilities, and costs for your LLM workloads.
OpenAI
GPT-5.3 Codex
Pricing (per 1M tokens)
Input$1.75
Output$14.00
Cached Input$0.1750
Context & Output
Context Window400K tokens
Max Output128K tokens
Capabilities
Categoryflagship
Multimodaltext + image
Fine-tuningNo
StreamingYes
xAI
Grok 3
Pricing (per 1M tokens)
Input$3.00
Output$15.00
Cached Input$0.7500
Context & Output
Context Window131.1K tokens
Max Output16.4K tokens
Capabilities
Categoryflagship
Multimodaltext + image
Fine-tuningNo
StreamingYes
Quick Verdict
Cheaper Input Price
GPT-5.3 Codex
41.7% cheaper
Cheaper Output Price
GPT-5.3 Codex
6.7% cheaper
Larger Context Window
GPT-5.3 Codex
+268.9K tokens
Cost Comparison
Sample workload: 1,000,000 input tokens + 1,000,000 output tokens
GPT-5.3 Codex
$15.75
$1.75/1M input + $14.00/1M output
Grok 3
$18.00
$3.00/1M input + $15.00/1M output
GPT-5.3 Codex is 12.5% cheaper for this workload.
Frequently Asked Questions
Which is cheaper, GPT-5.3 Codex or Grok 3?
For input tokens, GPT-5.3 Codex is cheaper at $1.75 per 1M tokens. For output tokens, GPT-5.3 Codex is cheaper at $14.00 per 1M tokens. The overall cost depends on your workload's input/output ratio.
What is the context window size of GPT-5.3 Codex vs Grok 3?
GPT-5.3 Codex has a context window of 400K tokens, while Grok 3 has 131.1K tokens. GPT-5.3 Codex supports a larger context window of 400K tokens, which is beneficial for processing longer documents.
Need more tools?
Explore our complete suite of LLM calculators and comparison tools.