Model comparison
GPT-5.3 Codex vs Grok 4.20 Multi-Agent
GPT-5.3 Codex and Grok 4.20 Multi-Agent score almost the same on the Noometry Index (45.8 vs 46.2), so choose on price, context window or the category you care about most.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in coding, where GPT-5.3 Codex leads 48.6 to 43.0.
- Grok 4.20 Multi-Agent is cheaper at $1.25 / $2.50 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- Grok 4.20 Multi-Agent accepts more context: 1M tokens versus 400K.
Side by side
| GPT-5.3 Codex | Grok 4.20 Multi-Agent | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 45.8 | 46.2 |
| Released | 2026-02-05 | 2026-03-09 |
| Weights | Proprietary | Proprietary |
| Context window | 400K | 1M |
| Max output | 128K | 30K |
| Input $ / M tokens | $1.75 | $1.25 |
| Output $ / M tokens | $14 | $2.50 |
| Results tracked | 8 | 20 |
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Category by category
Coding GPT-5.3 Codex leads
GPT-5.3 Codex: 48.6 (#56), Grok 4.20 Multi-Agent: 43.0 (#92)
| Benchmark | GPT-5.3 Codex | Grok 4.20 Multi-Agent |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1409 | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1457 |
| ALE-Bench | 1,655 | — |
Agentic & Tool Use Not comparable
GPT-5.3 Codex: 48.0 (#9), Grok 4.20 Multi-Agent: —
| Benchmark | GPT-5.3 Codex | Grok 4.20 Multi-Agent |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| LMArena Search | — | 1204 |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |
Reasoning Not comparable
GPT-5.3 Codex: —, Grok 4.20 Multi-Agent: 43.9 (#48)
| Benchmark | GPT-5.3 Codex | Grok 4.20 Multi-Agent |
|---|---|---|
| NYT Connections (extended) | — | 89.6% |
| LMArena Hard Prompts | — | 1448 |
| Epoch Capabilities Index | 156.77 | — |
Math Not comparable
GPT-5.3 Codex: —, Grok 4.20 Multi-Agent: 39.4 (#104)
| Benchmark | GPT-5.3 Codex | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Math | — | 1442 |
Knowledge Not comparable
GPT-5.3 Codex: —, Grok 4.20 Multi-Agent: 40.4 (#119)
| Benchmark | GPT-5.3 Codex | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Expert | — | 1445 |
Multimodal Not comparable
GPT-5.3 Codex: —, Grok 4.20 Multi-Agent: 40.5 (#48)
| Benchmark | GPT-5.3 Codex | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Vision | — | 1259 |
Multilingual Not comparable
GPT-5.3 Codex: —, Grok 4.20 Multi-Agent: 54.4 (#43)
| Benchmark | GPT-5.3 Codex | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Non-English | — | 1440 |
| LMArena Chinese | — | 1475 |
| LMArena French | — | 1466 |
| LMArena German | — | 1456 |
| LMArena Japanese | — | 1405 |
| LMArena Korean | — | 1416 |
| LMArena Russian | — | 1457 |
| LMArena Spanish | — | 1447 |
Instruction Following Not comparable
GPT-5.3 Codex: —, Grok 4.20 Multi-Agent: 74.8 (#84)
| Benchmark | GPT-5.3 Codex | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Instruction Following | — | 1420 |
Long Context Not comparable
GPT-5.3 Codex: —, Grok 4.20 Multi-Agent: 43.7 (#88)
| Benchmark | GPT-5.3 Codex | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Longer Query | — | 1431 |
Writing & Preference Not comparable
GPT-5.3 Codex: —, Grok 4.20 Multi-Agent: 64.0 (#59)
| Benchmark | GPT-5.3 Codex | Grok 4.20 Multi-Agent |
|---|---|---|
| LMArena Text | — | 1450 |
| LMArena Creative Writing | — | 1436 |
| LMArena Multi-Turn | — | 1452 |
Frequently asked questions
Is GPT-5.3 Codex better than Grok 4.20 Multi-Agent?
GPT-5.3 Codex and Grok 4.20 Multi-Agent score almost the same on the Noometry Index (45.8 vs 46.2), so choose on price, context window or the category you care about most.
Which is cheaper, GPT-5.3 Codex or Grok 4.20 Multi-Agent?
Grok 4.20 Multi-Agent is cheaper. It lists at $1.25 per million input tokens and $2.50 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.
Is GPT-5.3 Codex or Grok 4.20 Multi-Agent better for coding?
GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 43.0 in the Noometry coding category.
Which has the bigger context window?
Grok 4.20 Multi-Agent does, with 1M tokens against 400K.
How many benchmarks do GPT-5.3 Codex and Grok 4.20 Multi-Agent share?
0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Grok 4.20 Multi-Agent has 20.