GPT-5 vs Grok 4.3
OpenAI vs xAI — Grok 4.3 is 75% cheaper on output with the same input price, and offers 3.7x more context.
Pricing data verified: Jun 10, 2026
| Specification | GPT-5 | Grok 4.3 |
|---|---|---|
| Input Price (per 1M tokens) | $1.25 | $1.25 |
| Output Price (per 1M tokens) | $10.00 | $2.50 |
| Context Window | 272K tokens | 1M tokens |
| Tier | Flagship | Mid |
| Provider | OpenAI | xAI |
| Input Savings | Baseline | Same |
| Output Savings | Baseline | 75% cheaper |
| Cost at 1M input + 500K output | $6.25 | $2.50 |
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Which Model for Which Use Case?
Cost-Sensitive Workloads
Grok 4.3 matches GPT-5 on input price but is 75% cheaper on output. For high-output workloads like content generation or code completion, Grok 4.3 delivers significant savings.
Long-Context Processing
Grok 4.3's 1M context window is 3.7x larger than GPT-5's 272K. For processing lengthy documents or maintaining large conversation histories, Grok 4.3 gives you significantly more room.
Ecosystem Integration
GPT-5 benefits from OpenAI's extensive ecosystem — plugins, function calling, and a wide range of third-party tools. If your stack is built on OpenAI, GPT-5 offers the smoothest path.
Global Availability
GPT-5 has OpenAI's global infrastructure with availability across all regions. Grok 4.3 from xAI is growing but has more limited deployment. For worldwide access, GPT-5 has the edge.
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Frequently Asked Questions
Is Grok 4.3 cheaper than GPT-5?
Grok 4.3 costs $1.25/M input and $2.50/M output. GPT-5 costs $1.25/M input and $10.00/M output. Grok matches on input but is 75% cheaper on output. For a typical workload of 1M input + 500K output tokens/month, Grok costs $2.50 vs GPT-5's $6.25 — saving $3.75/month (60%).
Which has a larger context window, GPT-5 or Grok 4.3?
Grok 4.3 has a 1M token context window, which is 3.7x larger than GPT-5's 272K context. If you need to process long documents or maintain extensive conversation histories, Grok 4.3 offers significantly more room.
When should I choose GPT-5 over Grok 4.3?
Choose GPT-5 when: (1) you need OpenAI's ecosystem and integrations, (2) your workload fits within 272K context, (3) you want OpenAI's broader availability. Choose Grok 4.3 when: (1) cost efficiency on output matters (75% cheaper), (2) your workload requires more than 272K context, (3) you want xAI's platform.
Are GPT-5 and Grok 4.3 good for production use?
Both are production-ready. GPT-5 is OpenAI's flagship model with broad ecosystem support. Grok 4.3 from xAI offers competitive pricing at 75% less for output and a massive 1M context window. Both support enterprise-grade production workloads.