Data points: 73
Model compare
GPT-3.5 Turbo vs GPT-5.4
The readout for GPT-3.5 Turbo and GPT-5.4, before the detailed comparison sheet.
Key Takeaways
Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.4
GPT-5.4 has the higher weighted result; Model A / B score 8 to 92.
Evidence depth
73 data points
Includes 4 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.4
The charts below split 14 high-signal samples across speed, scores, and audit health.
Change comparison
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.
Comparison sheet
This report only uses LMSpeed data for GPT-3.5 Turbo and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-3.5 Turbo | GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 8.0 pts | 92.0 pts |
| Benchmark category leads | 0 categories | 3 categories |
| Operational advantages | Average speed, First-token latency | Cheapest input price, Free providers, Provider coverage |
| Context window | 16.4K tokens | 1.1M tokens |
| Max output | 4.1K tokens | 128K tokens |
| Modalities | Input Text Output Text | Input TextImageFile Output Text |
| Features | Text inputText outputTool callingStructured outputsJSON mode | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
Model metadata
Model metadata
| Model compare | GPT-3.5 Turbo | GPT-5.4 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Jan 2024 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2021-09-30 | No data |
| OpenRouter ID | openai/gpt-3.5-turbo | openai/gpt-5.4 |
| References | No data | No data |
When to choose each model
This report only uses LMSpeed data for GPT-3.5 Turbo and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-3.5 Turbo
GPT-3.5 Turbo has these operational advantages: Average speed, First-token latency.
GPT-5.4
GPT-5.4 is stronger in benchmark categories (Coding, Reasoning, Math) and operational dimensions (Cheapest input price, Free providers, Provider coverage).
Benchmark score comparison
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Category performance
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
- Model A coverage
- 3 / 8
- Model B coverage
- 7 / 8
- Shared
- 3 shared categories
Avg. score
GPT-3.5 Turbo
40
Avg. score
GPT-5.4
57.2
Agents
GPT-5.4
Coding
GPT-5.4 leads by 13.6
Reasoning
GPT-5.4 leads by 22.7
Knowledge
GPT-5.4
Math
GPT-5.4 leads by 19.8
Multilingual
No data
Multimodal
GPT-5.4
Instruction following
GPT-5.4
Professional benchmark details
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Professional benchmark details
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-3.5 Turbo
winner$1.50/M
Rank #62/180 · confidence 4
GPT-5.4
$15.00/M
Rank #155/180 · confidence 4
GPT-3.5 Turbo
winner$0.750/M
Rank #70/180 · confidence 4
GPT-5.4
$5.63/M
Rank #154/180 · confidence 4
GPT-3.5 Turbo
winner$0.500/M
Rank #83/180 · confidence 4
GPT-5.4
$2.50/M
Rank #150/180 · confidence 4
GPT-3.5 Turbo
29.7%
Rank #210/211 · confidence 4
GPT-5.4
winner74.8%
Rank #116/211 · confidence 4
API audit comparison
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
API audit comparison
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-3.5 Turbo | GPT-5.4 |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Provider examples
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
Provider examples
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-3.5 Turbo | GPT-5.4 |
|---|---|---|
巨量API39 tests | GPT-3.5 Turbo speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 43 tok/s / 12778ms input / output No data |
Sub2API20 tests | GPT-3.5 Turbo speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 51 tok/s / 4032ms input / output No data |
Sub2API20 tests | GPT-3.5 Turbo speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 34 tok/s / 1748ms input / output No data |
QQ Code10 tests | GPT-3.5 Turbo speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 55 tok/s / 2903ms input / output No data |
Sub2API10 tests | GPT-3.5 Turbo speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 54 tok/s / 1369ms input / output No data |
GPT-3.5 Turbo gpt-3.5-turbo speed / latency No data input / output $0.384/M/$0.767/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0/M/$0/M | |
GPT-3.5 Turbo gpt-3.5-turbo-0613 speed / latency No data input / output $0/request | GPT-5.4 gpt-5.4 speed / latency No data input / output $0/request | |
GPT-3.5 Turbo gpt-3.5-turbo-0125 speed / latency No data input / output $0.034/M/$0.103/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.0027/request | |
GPT-3.5 Turbo gpt-3.5-turbo-0125 speed / latency No data input / output $0.021/M/$0.062/M | GPT-5.4 gpt-5.4-medium speed / latency No data input / output $0.103/M/$0.616/M | |
GPT-3.5 Turbo gpt-3.5-turbo-1106 speed / latency No data input / output $0.024/M/$0.048/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.034/M/$0.205/M |
FAQ
Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
- Why is this comparison indexable?
- It has 6 verifiable comparison points, and both models have pricing or benchmark data.
- Are missing metrics invented?
- No. Metrics without LMSpeed data are omitted from this report.