| Signal | GPT-5.3-Codex | Delta | Grok 4 Fast |
|---|---|---|---|
Capabilities | 86 | -- | |
Context window size | 89 | -11 | |
Output Capacity | 85 | +11 | |
Pricing Tier | 14 | +14 | |
Recency | 100 | -- | |
Versatility | 50 | -- | |
| Overall Result | 2 wins | of 6 | 1 wins |
21
days ranked higher
2
days
7
days ranked higher
OpenAI
xAI
Grok 4 Fast saves you $830.00/month
That's $9960.00/year compared to GPT-5.3-Codex at your current usage level of 100K calls/month.
| Metric | GPT-5.3-Codex | Grok 4 Fast | Winner |
|---|---|---|---|
| Overall Score | 67 | 64 | GPT-5.3-Codex |
| Rank | #19 | #35 | GPT-5.3-Codex |
| Quality Rank | #19 | #35 | GPT-5.3-Codex |
| Adoption Rank | #19 | #35 | GPT-5.3-Codex |
| Parameters | -- | -- | -- |
| Context Window | 400K | 2000K | Grok 4 Fast |
| Pricing | $1.75/$14.00/M | $0.20/$0.50/M | -- |
| Signal Scores | |||
| Capabilities | 86 | 86 | GPT-5.3-Codex |
| Context window size | 89 | 100 | Grok 4 Fast |
| Output Capacity | 85 | 75 | GPT-5.3-Codex |
| Pricing Tier | 14 | 1 | GPT-5.3-Codex |
| Recency | 100 | 100 | GPT-5.3-Codex |
| Versatility | 50 | 50 | GPT-5.3-Codex |
GPT-5.3-Codex and Grok 4 Fast are extremely close in overall performance (only 2.799999999999997 points apart). Your best choice depends entirely on which specific strengths matter most for your use case.
Best for Quality
GPT-5.3-Codex
Marginally better benchmark scores; both are excellent
Best for Cost
Grok 4 Fast
96% lower pricing; better value at scale
Best for Reliability
GPT-5.3-Codex
Higher uptime and faster response speeds
Best for Prototyping
GPT-5.3-Codex
Stronger community support and better developer experience
Best for Production
GPT-5.3-Codex
Wider enterprise adoption and proven at scale
by OpenAI
GPT-5.3-Codex currently scores higher (67 vs 64), but the best choice depends on your specific use case, budget, and requirements.
GPT-5.3-Codex is ranked #19 and Grok 4 Fast is ranked #35. Rankings are based on a composite score from multiple signals including benchmarks, community sentiment, and adoption metrics.
Compare the detailed pricing breakdown above to see which model offers better value for your usage pattern.