GPT-5.3 Codex vs Grok 4.5: 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 4.5
Pricing (per 1M tokens)
Input$2.00
Output$6.00
Cached Input$0.3000
Context & Output
Context Window500K tokens
Max Output32.8K tokens
Capabilities
Categoryflagship
Multimodaltext + image
Fine-tuningNo
StreamingYes
Quick Verdict
Cheaper Input Price
GPT-5.3 Codex
12.5% cheaper
Cheaper Output Price
Grok 4.5
57.1% cheaper
Larger Context Window
Grok 4.5
+100K 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 4.5
$8.00
$2.00/1M input + $6.00/1M output
Grok 4.5 is 49.2% cheaper for this workload.
Frequently Asked Questions
Which is cheaper, GPT-5.3 Codex or Grok 4.5?
For input tokens, GPT-5.3 Codex is cheaper at $1.75 per 1M tokens. For output tokens, Grok 4.5 is cheaper at $6.00 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 4.5?
GPT-5.3 Codex has a context window of 400K tokens, while Grok 4.5 has 500K tokens. Grok 4.5 supports a larger context window of 500K tokens, which is beneficial for processing longer documents.
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