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GPT-5 Mini vs Grok 4.3
OpenAI's budget workhorse vs xAI's mid-tier contender. GPT-5 Mini is 80% cheaper on input, but Grok 4.3 offers 3.7x the context window — which tradeoff matters for your workload?
Pricing data verified: Jun 26, 2026
| Specification | GPT-5 Mini (OpenAI) | Grok 4.3 (xAI) |
|---|---|---|
| Input Price (per 1M tokens) | $0.25 | $1.25 |
| Output Price (per 1M tokens) | $2.00 | $2.50 |
| Context Window | 272K tokens | 1M tokens |
| Tier | Budget | Mid-Tier |
| Provider | OpenAI | xAI |
Calculate Your Exact Costs
Budget pricing vs mid-tier quality with a massive context window — see the real tradeoff for your workload.
Which Model for Which Use Case?
Chatbots & Virtual Assistants
High-volume conversational interfaces. GPT-5 Mini's 80% cheaper input pricing makes it the clear winner for chat applications where cost per message matters most.
Long Document Processing
Processing legal contracts, research papers, or codebases. Grok 4.3's 1M context window handles documents 3.7x larger than GPT-5 Mini's 272K limit — essential for true long-context work.
Content Generation
Blog posts, marketing copy, product descriptions. GPT-5 Mini's budget pricing handles high-volume output at 20% lower cost per token. Good enough quality for most content needs.
AI Agents & Autonomous Tasks
Multi-step autonomous workflows. Output-heavy by nature — GPT-5 Mini's 20% cheaper output pricing adds up at scale. For reasoning-heavy agents, Grok 4.3's mid-tier quality may be worth the premium.
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Frequently Asked Questions
How much cheaper is GPT-5 Mini than Grok 4.3?
GPT-5 Mini costs $0.25/$2.00 per 1M tokens. Grok 4.3 costs $1.25/$2.50 per 1M tokens. GPT-5 Mini is 80% cheaper on input and 20% cheaper on output — a 50% overall savings for most workloads.
Which has a larger context window?
Grok 4.3 has a 1M token context window, while GPT-5 Mini has a 272K token context window. Grok offers 3.7x the context — important if you process long documents or need extensive conversation history.
When should I choose GPT-5 Mini over Grok 4.3?
Choose GPT-5 Mini when cost is your primary concern — it's 80% cheaper on input tokens, making it ideal for high-volume, input-heavy workloads. Choose Grok 4.3 when you need a larger context window or mid-tier reasoning quality.
Is GPT-5 Mini good enough to replace Grok 4.3?
For many budget-conscious use cases — yes. GPT-5 Mini handles chatbots, content generation, and code assistance at 50-80% lower cost. However, Grok 4.3 may outperform on complex reasoning and offers a much larger context window.
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