Agents-A1 vs GPT-5.3 Codex
Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Verdict
GPT-5.3 Codex leads for most workloads.
Based on BenchLM composite scores, July 2026.
Agents-A1
63
GPT-5.3 Codex
82
Pick GPT-5.3 Codex if you want the stronger benchmark profile. Agents-A1 only becomes the better choice if agentic is the priority.
Category Radar
Head-to-Head by Category
Category Breakdown
| Benchmark | Agents-A1 | Δ | GPT-5.3 Codex |
|---|---|---|---|
| Agentic | 75.5 | ← 4.1 | 71.4 |
| Coding | — | — | 64.4 |
| Reasoning | 60.2 | — | — |
| Knowledge | 47.6 | — | — |
| Inst. Following | 94.8 | — | — |
Operational Comparison
Agents-A1
GPT-5.3 Codex
N/A
$1.75 / $14
N/A
79 t/s
N/A
88.26s
262K
400K
Quick Verdict
Pick GPT-5.3 Codex if you want the stronger benchmark profile. Agents-A1 only becomes the better choice if agentic is the priority.
GPT-5.3 Codex is clearly ahead on the provisional aggregate, 82 to 63. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
GPT-5.3 Codex gives you the larger context window at 400K, compared with 262K for Agents-A1.
Benchmark Deep Dive
Frequently Asked Questions (2)
Which is better, Agents-A1 or GPT-5.3 Codex?
GPT-5.3 Codex is ahead on BenchLM's provisional leaderboard, 82 to 63.
Which is better for agentic tasks, Agents-A1 or GPT-5.3 Codex?
Agents-A1 has the edge for agentic tasks in this comparison, averaging 75.5 versus 71.4. Inside this category, Tau2-Telecom is the benchmark that creates the most daylight between them.
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