gemini-3.5-flash vs gpt-5.4
Side-by-side comparison of gemini-3.5-flash and gpt-5.4: benchmarks, pricing, context window and capabilities. Both are accessible through Requesty's unified API. gpt-5.4 outperforms gemini-3.5-flash on 5 of 7 shared benchmarks.
gemini-3.5-flash
Input / 1M
$1.50
Output / 1M
$9.00
Context
1.0M
Model ID
google/gemini-3.5-flash
gpt-5.4
Input / 1M
$2.50
Output / 1M
$15.00
Context
1.1M
Model ID
openai/gpt-5.4
Benchmark comparison
Intelligence Indexreasoning
gemini-3.5-flash52.0%
gpt-5.453.1%
Coding Indexcoding
gemini-3.5-flash70.1%
gpt-5.471.1%
GPQA Diamondreasoning
gemini-3.5-flash92.2%
gpt-5.492.0%
Terminal-Bench Hardagentic
gemini-3.5-flash40.9%
gpt-5.457.6%
τ²-Benchagentic
gemini-3.5-flash95.3%
gpt-5.487.1%
SciCodecoding
gemini-3.5-flash53.1%
gpt-5.456.6%
Humanity's Last Examreasoning
gemini-3.5-flash42.7%
gpt-5.443.7%
Scores sourced from official model cards, Artificial Analysis, and public leaderboards. Benchmarks measure specific skills and don't capture every aspect of model quality.
Pricing & specifications
| gemini-3.5-flash | gpt-5.4 | |
|---|---|---|
| Input price / 1M | $1.50 | $2.50 |
| Output price / 1M | $9.00 | $15.00 |
| Context window | 1.0M tokens | 1.1M tokens |
| Max output | 66K tokens | 128K tokens |
| Vision input | Yes | Yes |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Prompt caching | Yes | Yes |
| Computer use | N/A | N/A |
| Provider | Google LLC (Gemini API) | OpenAI Inc. |
Questions people ask
Is gemini-3.5-flash better than gpt-5.4?
gpt-5.4 outperforms gemini-3.5-flash on 5 of 7 shared benchmarks. See the benchmark comparison above for specifics: gemini-3.5-flash and gpt-5.4 have different strengths across reasoning, coding, math and multimodal tasks.
Which is cheaper, gemini-3.5-flash or gpt-5.4?
gemini-3.5-flash is cheaper. gemini-3.5-flash costs $1.50/$9.00 per 1M input/output tokens, while gpt-5.4 costs $2.50/$15.00.
Can I use gemini-3.5-flash and gpt-5.4 through the same API?
Yes. Requesty provides a single OpenAI-compatible API that routes to both. Change just the "model" parameter to switch between "google/gemini-3.5-flash" and "openai/gpt-5.4", no other code changes needed.
What are the context windows?
gemini-3.5-flash supports up to 1.0M tokens of context. gpt-5.4 supports up to 1.1M tokens. Longer context means you can feed larger documents or codebases in a single prompt, though quality often degrades past 128K for most models.
Switch between gemini-3.5-flash and gpt-5.4 with one line of code
Requesty provides a single OpenAI-compatible API for 600+ models. Change the model parameter, not your code.