GPT-5.5 vs Grok 4.3
OpenAI vs xAI — Grok 4.3 is 75% cheaper on input and 92% cheaper on output, with comparable context.
Pricing data verified: Jun 10, 2026
| Specification | GPT-5.5 | Grok 4.3 |
|---|---|---|
| Input Price (per 1M tokens) | $5.00 | $1.25 |
| Output Price (per 1M tokens) | $30.00 | $2.50 |
| Context Window | 1.05M tokens | 1M tokens |
| Tier | Premium | Mid |
| Provider | OpenAI | xAI |
| Cost at 1M input + 500K output | $20.00 | $2.50 |
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Which Model for Which Use Case?
Extreme Cost Savings
Grok 4.3 at $1.25/M input is 75% cheaper than GPT-5.5. For high-volume applications where cost per token is critical, Grok delivers massive savings.
Maximum Quality
GPT-5.5 is OpenAI's most capable model. For applications requiring the absolute highest quality output, GPT-5.5 justifies its premium pricing.
Output-Heavy Workloads
Grok 4.3 at $2.50/M output is 92% cheaper than GPT-5.5's $30.00/M. For content generation, code completion, or any high-output task, Grok saves dramatically.
Premium vs Value
GPT-5.5 commands a premium for the highest quality. Grok 4.3 delivers 80%+ of the capability at 75-92% less cost. Choose based on your quality requirements.
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Frequently Asked Questions
Is Grok 4.3 cheaper than GPT-5.5?
Yes. Grok 4.3 costs $1.25/M input and $2.50/M output. GPT-5.5 costs $5.00/M input and $30.00/M output. Grok is 75% cheaper on input and 92% cheaper on output. For 1M input + 500K output/month, Grok costs $2.50 vs GPT-5.5's $20.00 — saving $17.50/month (88%).
Which has a larger context window?
GPT-5.5 has a 1.05M token context window, which is slightly larger than Grok 4.3's 1M context. The difference is minimal — both handle very long contexts.
When should I choose GPT-5.5 over Grok 4.3?
Choose GPT-5.5 when: (1) you need OpenAI's premium quality, (2) you want the broader ecosystem, (3) your workload requires the absolute highest reasoning. Choose Grok 4.3 when: (1) cost is critical (75-92% cheaper), (2) you want xAI's platform, (3) Grok's capabilities meet your needs.
Are both models production-ready?
Both support production workloads. GPT-5.5 is OpenAI's most capable premium model. Grok 4.3 from xAI offers competitive performance at 75-92% lower cost with a comparable 1M context.