GPT-5.3 Codex vs LongCat-Flash-Chat: Specs & Benchmark Comparison
| Characteristic | GPT-5.3 Codex | LongCat-Flash-Chat |
|---|---|---|
| Company | OpenAI | Meituan |
| Release Date | February 5, 2026 | August 28, 2025 |
| Parameters | — | 560B |
| Multimodal | Yes | No |
| Context (input) | 400K | — |
| Context (output) | 128K | — |
| Input Price / 1M | $1.75 | — |
| Output Price / 1M | $14.00 | — |
| Average Score | 0.7 | 0.9 |
Verdict
GPT-5.3 Codex leads in 1 out of 2 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.3 Codex — 0.7, LongCat-Flash-Chat — 0.9.
Recency
GPT-5.3 Codex is newer: released 2/5/2026 vs 8/28/2025.
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The GPT-5.3 Codex and LongCat-Flash-Chat comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.3 Codex or LongCat-Flash-Chat page. See also the complete list of AI model comparisons.