Updated March 26, 2026· Based on independent benchmark data
Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) leads in intelligence with a score of 51.7 vs 49.0. GPT-5.2 Codex (xhigh) is 1.7x cheaper at $1.75/1M tokens vs $3.00/1M. For speed, GPT-5.2 Codex (xhigh) wins at 99 tok/s vs 71 tok/s.
| Metric | GPT-5.2 Codex (xhigh) | Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) |
|---|---|---|
| Intelligence Score | 49.0 | 51.7 |
| Coding Score | 43.0 | 50.9 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 99 tok/s | 71 tok/s |
| Latency (TTFT) | 6.86s | 32.16s |
| Input Price / 1M tokens | $1.75 | $3.00 |
| Output Price / 1M tokens | $14 | $15 |
| Context Window |
Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) outperforms GPT-5.2 Codex (xhigh) on the intelligence index with a score of 51.7 compared to 49.0. For coding tasks, Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) has the edge with a coding score of 50.9 vs 43.0.
GPT-5.2 Codex (xhigh) generates output significantly faster at 99 tok/s compared to Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort)'s 71 tok/s, making it 1.4x faster for streaming responses. Time to first token is 6.86s for GPT-5.2 Codex (xhigh) vs 32.16s for Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort), which affects perceived responsiveness in interactive applications.
GPT-5.2 Codex (xhigh) is more affordable at $1.75/1M input tokens ($14/1M output), while Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) costs $3.00/1M input ($15/1M output). For a typical workload of 100 requests per day at 2,000 tokens each, GPT-5.2 Codex (xhigh) would cost approximately $10.50/month vs $18.00/month for Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) in input costs alone.
Choose GPT-5.2 Codex (xhigh) when you need faster output (99 tok/s), lower cost. Choose Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) when you need higher intelligence (51.7), stronger coding performance (50.9).
Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) scores higher on coding benchmarks (50.9 vs 43.0), making it the better choice for programming tasks.
GPT-5.2 Codex (xhigh) is cheaper at $1.75/1M input tokens vs $3.00/1M for Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort).
GPT-5.2 Codex (xhigh) is faster, producing output at 99 tok/s compared to Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort)'s 71 tok/s.
No, GPT-5.2 Codex (xhigh) does not support image input. Neither model supports image input.
Data last synced: March 26, 2026
| N/A |
| N/A |
| Max Output Tokens | N/A | N/A |
| Input Modalities | Text | Text |
| Output Modalities | Text | Text |
| Free Tier | No | No |
It depends on your priorities. Claude Sonnet 4.6 (Adaptive Reasoning, Max Effort) scores higher on intelligence (51.7), but GPT-5.2 Codex (xhigh) may be better for specific use cases like budget-conscious projects or speed-critical applications.