Grok 4.3 vs o3
Grok 4.3 vs o3: Grok 4.3 is cheaper for input-heavy usage ($1.25/M vs $2.00/M input tokens), while Grok 4.3 is better for long-context tasks (1,000,000 tokens).
Direct answer: choose Grok 4.3 for lower token spend and choose Grok 4.3 when your workload needs longer context.
Compare input and output token pricing, context windows, and monthly cost estimates on one page so you can pick the cheaper model fast.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
Grok 4.3
o3
Cost Differences
o3 costs more than Grok 4.3
Quick Recommendation
Winner for direct API pricing: Grok 4.3. At the default workload, Grok 4.3 saves about $10.50/month ($127.75/year) versus o3.
Feature Comparison
| Feature | Grok 4.3 | o3 |
|---|---|---|
| Provider | xAI | OpenAI |
| Input Price | $1.25/1M tokens | $2.00/1M tokens |
| Output Price | $2.50/1M tokens | $8.00/1M tokens |
| Context Window | 1,000,000 tokens | 1,000,000 tokens |
| Max Output | 131,072 tokens | 131,072 tokens |
| Category | reasoning | reasoning |
| Capabilities | textvisionreasoning | textreasoningvisioncode |
| Release Date | 4/30/2026 | 4/16/2025 |
Grok 4.3 vs o3: Which Should You Choose?
Choosing between Grok 4.3 and o3 depends on your priorities: cost efficiency, context length, or raw capability. Grok 4.3 is the more affordable option at $1.25/1M input tokens — 38% cheaper than o3.
These models come from different providers — xAI and OpenAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with xAI, switching to OpenAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
Both models are in the reasoning category, making this a direct head-to-head comparison. At scale — say 10,000 requests per day — the cost difference adds up: Grok 4.3 would save you roughly $1,050.00/month compared to o3. For startups and indie developers, that difference can be significant.
Output costs matter too. Grok 4.3 charges $2.50/1M output tokens vs $8.00 for o3. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Grok 4.3 has the edge here at $2.50/1M output tokens.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose Grok 4.3 when:
- • Budget is a primary concern
- • You're already using xAI's API ecosystem
Choose o3 when:
- • You need more capabilities (code)
- • You're already using OpenAI's API ecosystem
Pros and Caveats at a Glance
Grok 4.3
- • Input pricing: $1.25/M tokens
- • Output pricing: $2.50/M tokens
- • Context window: 1,000,000 tokens
- • Max output: 131,072 tokens
Watch out for
- • Trade-offs are minor in this matchup.
o3
- • Input pricing: $2.00/M tokens
- • Output pricing: $8.00/M tokens
- • Context window: 1,000,000 tokens
- • Max output: 131,072 tokens
Watch out for
- • Higher input cost than Grok 4.3
- • Higher output cost than Grok 4.3
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Grok 4.3 (xAI)
o3 (OpenAI)
Start using Grok 4.3 today
Sign Up for xAI →Start using o3 today
Sign Up for OpenAI →Frequently Asked Questions
Which is cheaper, Grok 4.3 or o3?▼
What is the context window difference between Grok 4.3 and o3?▼
Which model is better for AI Chatbot?▼
Which model has better overall pricing for heavy usage?▼
Where can I compare xAI and OpenAI API pricing beyond this model matchup?▼
Related Comparisons
Related Articles
Learn when to pick each model, then compare live pricing scenarios.