Gemini 3.5 Flash vs GPT-5.4
API pricing, context window and capabilities for Gemini 3.5 Flash and GPT-5.4, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersGemini 3.5 Flash wins on price and on Terminal-Bench. GPT-5.4 wins on intelligence and on context window.
Price
Gemini 3.5 Flash
Terminal-Bench
Gemini 3.5 Flash
Intelligence
GPT-5.4
Context window
GPT-5.4
Key takeaways
who wins on what, from the published numbersGemini 3.5 Flash wins
- Cheaper input ($1.50 vs $2.50 /1M)
- Cheaper output ($9.00 vs $15.00 /1M)
- More serving providers (7 vs 6)
- Supports audio
GPT-5.4 wins
- Larger context window (1M vs 1.1M)
- Higher max output (66K vs 128K)
Cheaper overall
Gemini 3.5 Flash
$1.50 + $9.00 /1M
Larger context
GPT-5.4
1.1M
More providers
Gemini 3.5 Flash
7 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| Gemini 3.5 Flash | GPT-5.4 | |
|---|---|---|
| Input $/1M | $1.50via Google best | $2.50via Databricks |
| Output $/1M | $9.00via Google best | $15.00via OpenAI |
| Context window | 1M | 1.1M best |
| Max output | 66K | 128K best |
| Serving providers | 7 best | 6 |
| Date | Released May 22, 2026 | Released Mar 5, 2026 |
Benchmarks
Benchmark scores, side by side| Gemini 3.5 Flash | GPT-5.4 | |
|---|---|---|
| Intelligence | 32.6 | 39.0 best |
| Terminal-Bench | 79% best | 78% |
| GPQA Diamond | 92% | 92% |
| Output speed | 197 t/s best | 92 t/s |
| Latency (TTFT) | 17.14s best | 192.30s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Gemini 3.5 Flash
via OpenRouter
$17
GPT-5.4
via Databricks
$27
Capabilities
feature support, side by side| Feature | Gemini 3.5 Flash | GPT-5.4 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | ✓ | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Gemini 3.5 Flash or GPT-5.4?
Gemini 3.5 Flash is cheaper for input ($1.50 vs $2.50 per 1M tokens) from Google. Gemini 3.5 Flash is cheaper for output ($9.00 vs $15.00 per 1M tokens) from Google.
What is the context window difference between Gemini 3.5 Flash and GPT-5.4?
Gemini 3.5 Flash has a 1M-token context window and GPT-5.4 has 1.1M tokens, so GPT-5.4 can take a larger prompt.
How do Gemini 3.5 Flash and GPT-5.4 compare on benchmarks?
On the tracked benchmarks, Gemini 3.5 Flash leads on Terminal-Bench, and GPT-5.4 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
Every weekday
AI moves fast. Here's your debrief.
News, analysis, tools, and more.
For people who build with AI