Data points: 124
Model compare
The readout for Gemini 2.5 Flash and GPT-5.4, before the detailed comparison sheet.
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 12 to 88.
Evidence depth
124 data points
Includes 22 benchmark rows, 3 audit samples, and 8 provider examples.
Selection signal
Start with GPT-5.4
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.
This report only uses LMSpeed data for Gemini 2.5 Flash and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | Gemini 2.5 Flash | GPT-5.4 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 12.0 pts | 88.0 pts |
| Benchmark category leads | 0 categories | 6 categories |
| Operational advantages | Cheapest input price, Average speed, Free providers | First-token latency, Provider coverage |
| Context window | 1.0M tokens | 1.1M tokens |
| Max output | 65.5K tokens | 128K tokens |
| Modalities | Input FileImageTextAudiovideo |
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 compare | Gemini 2.5 Flash | GPT-5.4 |
|---|---|---|
| Developer | OpenAI | |
| Released | Jun 2025 | Mar 2026 |
| Parameters | No data | No data |
| Tokenizer | Gemini | GPT |
| Knowledge cutoff | 2025-01-31 | No data |
| OpenRouter ID | google/gemini-2.5-flash | openai/gpt-5.4 |
| References | No data | No data |
This report only uses LMSpeed data for Gemini 2.5 Flash and GPT-5.4: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
Gemini 2.5 Flash
Gemini 2.5 Flash has these operational advantages: Cheapest input price, Average speed, Free providers.
GPT-5.4
GPT-5.4 is stronger in benchmark categories (Agents, Coding, Reasoning, Knowledge, Math) and operational dimensions (First-token latency, Provider coverage).
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
Gemini 2.5 Flash
45.4
Avg. score
GPT-5.4
57.4
GPT-5.4 leads by 20.2
GPT-5.4 leads by 11.9
GPT-5.4 leads by 7.2
GPT-5.4 leads by 18.1
GPT-5.4 leads by 6.8
No data
GPT-5.4
GPT-5.4 leads by 11.2
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Gemini 2.5 Flash
45.0
Rank #68/84 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner67.0
Rank #19/84 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
winner$0.300/M
Rank #46/162 · confidence 4
GPT-5.4
$2.50/M
Rank #131/162 · confidence 4
Gemini 2.5 Flash
winner$0.850/M
Rank #67/162 · confidence 4
GPT-5.4
$5.63/M
Rank #135/162 · confidence 4
Gemini 2.5 Flash
winner$2.50/M
Rank #75/162 · confidence 4
GPT-5.4
$15.00/M
Rank #136/162 · confidence 4
Gemini 2.5 Flash
45.9
Rank #72/89 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner74.0
Rank #6/89 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
1.4
Rank #50/73 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner23.4
Rank #7/73 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
winner79.0%
Rank #76/188 · confidence 4
GPT-5.4
74.8%
Rank #96/188 · confidence 4
Gemini 2.5 Flash
winner11.1%
Rank #89/187 · confidence 4
GPT-5.4
10.6%
Rank #91/187 · confidence 4
Gemini 2.5 Flash
29.1
Rank #88/96 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner56.6
Rank #4/96 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
39.4%
Rank #80/185 · confidence 4
GPT-5.4
winner47.1%
Rank #24/185 · confidence 4
Gemini 2.5 Flash
4.8
Rank #38/47 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner47.6
Rank #7/47 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
4.2
Rank #23/35 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner27.1
Rank #8/35 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
29.1
Rank #44/56 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner65.9
Rank #17/56 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
winner93.3
Rank #6/90 · confidence 1 · eval date 2025-06-17
GPT-5.4
88.6
Rank #18/90 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
5.1
Rank #79/96 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner41.6
Rank #8/96 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
26.5
Rank #51/90 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner50.0
Rank #9/90 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
14.1
Rank #86/99 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner51.4
Rank #10/99 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
68.3
Rank #76/96 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner92.0
Rank #11/96 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
65.5
Rank #43/57 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner78.4
Rank #16/57 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
1140.0
Rank #55/66 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner1245.0
Rank #32/66 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
39.0
Rank #74/86 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner73.9
Rank #24/86 · confidence 3 · eval date 2026-03-05
Gemini 2.5 Flash
14.9
Rank #84/84 · confidence 1 · eval date 2025-06-17
GPT-5.4
winner87.1
Rank #37/84 · confidence 3 · eval date 2026-03-05
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | Gemini 2.5 Flash | GPT-5.4 |
|---|---|---|
Winner: GPT-5.4 | Gemini 2.5 Flash gemini-2.5-flash No audit yet | GPT-5.4 gpt-5.4 Audit score 100 100100100100 |
Winner: GPT-5.4 | Gemini 2.5 Flash gemini-2.5-flash No audit yet | GPT-5.4 gpt-5.4 Audit score 93 1008486100 |
Winner: GPT-5.4 | Gemini 2.5 Flash gemini-2.5-flash No audit yet | GPT-5.4 gpt-5.4 Audit score 90 1008476100 |
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | Gemini 2.5 Flash | GPT-5.4 |
|---|---|---|
50 tests | Gemini 2.5 Flash speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 50 tok/s / 7305ms input / output No data |
25 tests | Gemini 2.5 Flash speed / latency 139 tok/s / 4002ms input / output No data | GPT-5.4 speed / latency N/A / N/A input / output No data |
10 tests | Gemini 2.5 Flash speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 51 tok/s / 2526ms input / output No data |
10 tests | Gemini 2.5 Flash speed / latency 54 tok/s / 10365ms input / output No data | GPT-5.4 speed / latency N/A / N/A input / output No data |
10 tests | Gemini 2.5 Flash speed / latency N/A / N/A input / output No data | GPT-5.4 speed / latency 51 tok/s / 1443ms input / output No data |
Gemini 2.5 Flash gemini-2.5-flash speed / latency No data input / output $0/M/$0/M | GPT-5.4 gpt-5.4 speed / latency No data input / output $0.240/M | |
Gemini 2.5 Flash gemini-2.5-flash speed / latency No data input / output $0/M/$0/M | GPT-5.4 gpt-5.4-openai-compact speed / latency No data input / output $0/M | |
Gemini 2.5 Flash gemini-2.5-flash-nothinking speed / latency No data input / output $0/request | GPT-5.4 gpt-5.4-2026-03-05 speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.4. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Output
Input TextImageFile Output Text |
| Features | Text inputImage inputFile inputAudio inputText outputTool callingStructured outputsJSON modeReasoning | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
