GPT-5.3 Codex vs SWE-1.7
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.
GPT-5.3 Codex
82
SWE-1.7
75
Pick GPT-5.3 Codex if you want the stronger benchmark profile. SWE-1.7 only becomes the better choice if agentic is the priority.
Category Radar
Head-to-Head by Category
Category Breakdown
| Benchmark | GPT-5.3 Codex | Δ | SWE-1.7 |
|---|---|---|---|
| Agentic | 71.4 | → 10.1 | 81.5 |
| Coding | 64.4 | — | — |
Operational Comparison
GPT-5.3 Codex
SWE-1.7
$1.75 / $14
N/A
79 t/s
N/A
88.26s
N/A
400K
256K
Quick Verdict
Pick GPT-5.3 Codex if you want the stronger benchmark profile. SWE-1.7 only becomes the better choice if agentic is the priority.
GPT-5.3 Codex is clearly ahead on the provisional aggregate, 82 to 75. 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 256K for SWE-1.7.
Benchmark Deep Dive
Frequently Asked Questions (2)
Which is better, GPT-5.3 Codex or SWE-1.7?
GPT-5.3 Codex is ahead on BenchLM's provisional leaderboard, 82 to 75. The biggest single separator in this matchup is Terminal-Bench 2.0, where the scores are 77.3% and 81.5%.
Which is better for agentic tasks, GPT-5.3 Codex or SWE-1.7?
SWE-1.7 has the edge for agentic tasks in this comparison, averaging 81.5 versus 71.4. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
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