Data points: 66
The readout for GPT-5.3 Codex and Grok 4.20 Multi Agent, before the detailed comparison sheet.
Decision read
Tie
Tie currently has the stronger profile, with verified wins split 2 to 2.
Evidence depth
66 data points
Includes 2 benchmark rows, 0 audit samples, and 7 provider examples.
Selection signal
Tie
The charts below split 9 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
Model compare GPT-5.3 Codex vs Grok 4.20 Multi Agentgpt-5-3-codex-vs-grok-4-20-multi-agent | Model A GPT-5.3 Codex | Model B Grok 4.20 Multi Agent |
|---|---|---|
| Overall leader | Tie | Tie |
| Verified metric wins | 2 wins | 2 wins |
| Where it leads | Provider coverage, Recent tests | Cheapest input price, Free providers |
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
GPT-5.3 Codex
66.4
Avg. score
Grok 4.20 Multi Agent
-
Selected category
Agents
GPT-5.3 Codex
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.3 Codex
winner82.0
Rank #11/127 · confidence 1 · eval date 2026-02-05
Grok 4.20 Multi Agent
76.0
Rank #21/127 · confidence 1 · eval date 2026-03-10
GPT-5.3 Codex
87.8
Rank #11/75 · confidence 1 · eval date 2026-02-05
Grok 4.20 Multi Agent
winner93.3
Rank #1/75 · confidence 1 · eval date 2026-03-10
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.3 Codex | Grok 4.20 Multi Agent |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-5.3 Codex | Grok 4.20 Multi Agent |
|---|---|---|
5 tests | GPT-5.3 Codex speed / latency 35 tok/s / 17640ms input / output No data |
This report only uses LMSpeed data for GPT-5.3 Codex and Grok 4.20 Multi Agent: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GPT-5.3 Codex | Grok 4.20 Multi Agent |
|---|---|---|
| When to choose each model | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Provider coverage, Recent tests. | Grok 4.20 Multi Agent Grok 4.20 Multi Agent is stronger when you prioritize Cheapest input price, Free providers. |
TL;DR: Tie leads across 66 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GPT-5.3 Codex vs Grok 4.20 Multi Agent into nearby model comparisons with enough verified LMSpeed data.
| Model metadata | GPT-5.3 Codex exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. | Grok 4.20 Multi Agent exposes 2M tokens; notable signals: Text input, Image input, File input, Text output. |
|---|---|---|
| Developer | OpenAI | xAI |
| Context window | 400K tokens | 2M tokens |
| Max output | 128K tokens | No data |
| Released | Feb 2026 | Mar 2026 |
| Modalities | Input TextImageFile Output Text | Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputStructured outputsJSON modeReasoning |
| Parameters | No data | No data |
| Tokenizer | GPT | Grok |
| Knowledge cutoff | No data | 2025-09-01 |
| OpenRouter ID | openai/gpt-5.3-codex | x-ai/grok-4.20-multi-agent |
| References | No data | No data |
Grok 4.20 Multi Agent
speed / latency
N/A / N/A
input / output
No data
Compute Token5 tests | GPT-5.3 Codex speed / latency 22 tok/s / 3141ms input / output No data | Grok 4.20 Multi Agent speed / latency N/A / N/A input / output No data |
|---|
Seamee API5 tests | GPT-5.3 Codex speed / latency 53 tok/s / 3889ms input / output No data | Grok 4.20 Multi Agent speed / latency N/A / N/A input / output No data |
|---|
0CHAT0 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | Grok 4.20 Multi Agent speed / latency N/A / N/A input / output No data |
|---|
AI API0 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | Grok 4.20 Multi Agent speed / latency N/A / N/A input / output No data |
|---|
GPT-5.3 Codex gpt-5.3-codex-openai-compact speed / latency No data input / output $75.00/M/$600.00/M | Grok 4.20 Multi Agent grok-4.20-multi-agent-high speed / latency No data input / output $0/M/$0/M |
GPT-5.3 Codex gpt-5.3-codex-spark speed / latency No data input / output $0/request | Grok 4.20 Multi Agent grok-4.20-multi-agent-0309 speed / latency No data input / output $0/request |
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
