Data points: 100
The readout for GPT-5.3 Codex and gpt-oss-120b, before the detailed comparison sheet.
Decision read
GPT-5.3 Codex
GPT-5.3 Codex currently has the stronger profile, with verified wins split 4 to 0.
Evidence depth
100 data points
Includes 30 benchmark rows, 0 audit samples, and 3 provider examples.
Selection signal
Start with GPT-5.3 Codex
The charts below split 33 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 gpt-oss-120bgpt-5-3-codex-vs-gpt-oss-120b | Model A GPT-5.3 Codex | Model B gpt-oss-120b |
|---|---|---|
| Overall leader | Leading | Contender |
| Verified metric wins | 4 wins | 0 wins |
| Where it leads | Cheapest input price, Free providers, Provider coverage, Recent tests |
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
67.6
Avg. score
gpt-oss-120b
56.5
Selected category
Agents
GPT-5.3 Codex leads by 33.7
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-5.3 Codex
winner82.0
Rank #8/96 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
34.0
Rank #71/96 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
89.9 tok/s
Rank #55/113 · confidence 4
gpt-oss-120b
winner330.2 tok/s
Rank #1/113 · confidence 4
GPT-5.3 Codex
87.44 s
Rank #112/113 · confidence 4
gpt-oss-120b
winner0.50 s
Rank #8/113 · confidence 4
GPT-5.3 Codex
87.44 s
Rank #110/113 · confidence 4
gpt-oss-120b
winner6.56 s
Rank #58/113 · confidence 4
GPT-5.3 Codex
$4.81/M
Rank #113/138 · confidence 4
gpt-oss-120b
winner$0.262/M
Rank #20/138 · confidence 4
GPT-5.3 Codex
$1.75/M
Rank #104/138 · confidence 4
gpt-oss-120b
winner$0.150/M
Rank #20/138 · confidence 4
GPT-5.3 Codex
$14.00/M
Rank #113/138 · confidence 4
gpt-oss-120b
winner$0.600/M
Rank #22/138 · confidence 4
GPT-5.3 Codex
winner87.7
Rank #3/65 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
29.2
Rank #53/65 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner74.0
Rank #4/67 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
50.7
Rank #50/67 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner16.9
Rank #6/54 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
1.1
Rank #37/54 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner91.5%
Rank #6/152 · confidence 4
gpt-oss-120b
67.2%
Rank #96/152 · confidence 4
GPT-5.3 Codex
winner39.9%
Rank #8/150 · confidence 4
gpt-oss-120b
5.2%
Rank #104/150 · confidence 4
GPT-5.3 Codex
winner53.0
Rank #5/69 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
23.5
Rank #51/69 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner83.6
Rank #7/83 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
21.3
Rank #72/83 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner53.2%
Rank #7/149 · confidence 4
gpt-oss-120b
36.0%
Rank #81/149 · confidence 4
GPT-5.3 Codex
winner53.2
Rank #8/74 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
38.9
Rank #47/74 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner51.8
Rank #3/68 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
21.5
Rank #53/68 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner91.5
Rank #4/74 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
78.2
Rank #48/74 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner89.3
Rank #4/79 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
39.1
Rank #61/79 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner39.9
Rank #5/74 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
18.5
Rank #41/74 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner44.3
Rank #6/77 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
23.8
Rank #52/77 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
86.9
Rank #18/68 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
winner91.2
Rank #7/68 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner95.2
Rank #5/59 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
36.4
Rank #41/59 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner91.3
Rank #2/70 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
24.1
Rank #62/70 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner1205.0
Rank #33/50 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
1011.0
Rank #47/50 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner87.8
Rank #7/66 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
45.9
Rank #57/66 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner75.4
Rank #15/70 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
69.0
Rank #32/70 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner57.5
Rank #10/42 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
29.6
Rank #39/42 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner78.4
Rank #14/81 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
33.0
Rank #67/81 · confidence 1 · eval date 2025-08-05
GPT-5.3 Codex
winner86.0
Rank #30/68 · confidence 1 · eval date 2026-02-05
gpt-oss-120b
65.8
Rank #47/68 · confidence 1 · eval date 2025-08-05
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-5.3 Codex | gpt-oss-120b |
|---|---|---|
| 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 | gpt-oss-120b |
|---|---|---|
10 tests | GPT-5.3 Codex speed / latency 201 tok/s / 2135ms input / output No data |
This report only uses LMSpeed data for GPT-5.3 Codex and gpt-oss-120b: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Guidance | GPT-5.3 Codex | gpt-oss-120b |
|---|---|---|
| When to choose each model | GPT-5.3 Codex GPT-5.3 Codex is stronger when you prioritize Cheapest input price, Free providers, Provider coverage, Recent tests. | gpt-oss-120b gpt-oss-120b does not clearly lead on the verified metrics here, so check provider-specific pricing before choosing. |
TL;DR: GPT-5.3 Codex leads across 100 verifiable data points, including pricing, speed, latency, benchmarks, and provider examples.
Continue from GPT-5.3 Codex vs gpt-oss-120b into nearby model comparisons with enough verified LMSpeed data.
| No data |
| Model metadata | GPT-5.3 Codex exposes 400K tokens; notable signals: Text input, Image input, File input, Text output. | gpt-oss-120b exposes 131.1K tokens; notable signals: Text input, Text output, Tool calling, Structured outputs. |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Context window | 400K tokens | 131.1K tokens |
| Max output | 128K tokens | 131.1K tokens |
| Released | Feb 2026 | No data |
| Modalities | Input TextImageFile Output Text | Input Text Output Text |
| Features | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning | Text inputText outputTool callingStructured outputsJSON modeReasoning |
| Parameters | No data | 120B |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | No data | 2024-06-30 |
| OpenRouter ID | openai/gpt-5.3-codex | openai/gpt-oss-120b |
| References | No data | No data |
gpt-oss-120b
speed / latency
N/A / N/A
input / output
No data
Crond0 tests | GPT-5.3 Codex gpt-5.3-codex-spark speed / latency N/A / N/A input / output $6.00/M / $48.00/M | gpt-oss-120b gpt-oss-120b-免费 speed / latency N/A / N/A input / output $15.00/M / $15.00/M |
|---|
R的API小站0 tests | GPT-5.3 Codex speed / latency N/A / N/A input / output No data | gpt-oss-120b speed / latency N/A / N/A input / output No data |
|---|
Rankings are based on community-submitted tests and periodic health probes. Advisory only, not official data.
