Codex Mini vs Grok Code Fast 1
Codex Mini vs Grok Code Fast 1: Grok Code Fast 1 is cheaper for input-heavy usage ($0.20/M vs $1.50/M input tokens), while Grok Code Fast 1 is better for long-context tasks (256,000 tokens).
Direct answer: choose Grok Code Fast 1 for lower token spend and choose Grok Code Fast 1 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)
Codex Mini
Grok Code Fast 1
Cost Differences
Grok Code Fast 1 costs less than Codex Mini
Quick Recommendation
Winner for direct API pricing: Grok Code Fast 1. At the default workload, Grok Code Fast 1 saves about $10.65/month ($129.575/year) versus Codex Mini.
Feature Comparison
| Feature | Codex Mini | Grok Code Fast 1 |
|---|---|---|
| Provider | OpenAI | xAI |
| Input Price | $1.50/1M tokens | $0.20/1M tokens |
| Output Price | $6.00/1M tokens | $1.50/1M tokens |
| Context Window | 200,000 tokens | 256,000 tokens |
| Max Output | 32,768 tokens | 32,768 tokens |
| Category | efficient | standard |
| Capabilities | textcodereasoning | textcodereasoning |
| Release Date | 2/2/2026 | 2/1/2026 |
Codex Mini vs Grok Code Fast 1: Which Should You Choose?
Choosing between Codex Mini and Grok Code Fast 1 depends on your priorities: cost efficiency, context length, or raw capability. Grok Code Fast 1 is the more affordable option at $0.20/1M input tokens — 87% cheaper than Codex Mini. Meanwhile, Grok Code Fast 1 offers a significantly larger context window at 256,000 tokens vs 200,000 for Codex Mini.
These models come from different providers — OpenAI and xAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with OpenAI, switching to xAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
These models target different tiers: Codex Mini is a efficient model while Grok Code Fast 1 is standard. This means they're optimized for different workloads. Grok Code Fast 1 targets more demanding workloads, while Codex Mini provides a cost-effective option for everyday tasks.
Output costs matter too. Codex Mini charges $6.00/1M output tokens vs $1.50 for Grok Code Fast 1. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Grok Code Fast 1 has the edge here at $1.50/1M output tokens.
Best Use Cases
Choose Codex Mini when:
- • You're already using OpenAI's API ecosystem
- • You're running high-volume, latency-sensitive workloads
Choose Grok Code Fast 1 when:
- • Budget is a primary concern
- • You need a larger context window (256,000 tokens)
- • You're already using xAI's API ecosystem
Pros and Caveats at a Glance
Codex Mini
- • Input pricing: $1.50/M tokens
- • Output pricing: $6.00/M tokens
- • Context window: 200,000 tokens
- • Max output: 32,768 tokens
Watch out for
- • Higher input cost than Grok Code Fast 1
- • Higher output cost than Grok Code Fast 1
- • Smaller context window than Grok Code Fast 1
Grok Code Fast 1
- • Input pricing: $0.20/M tokens
- • Output pricing: $1.50/M tokens
- • Context window: 256,000 tokens
- • Max output: 32,768 tokens
Watch out for
- • Trade-offs are minor in this matchup.
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
Codex Mini (OpenAI)
Grok Code Fast 1 (xAI)
Start using Codex Mini today
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Sign Up for xAI →Frequently Asked Questions
Which is cheaper, Codex Mini or Grok Code Fast 1?▼
What is the context window difference between Codex Mini and Grok Code Fast 1?▼
Which model is better for AI Agent / Agentic Workflows?▼
Which model has better overall pricing for heavy usage?▼
Where can I compare OpenAI and xAI API pricing beyond this model matchup?▼
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