Model comparison
Gemini 3.5 Flash vs GPT-5.4 Mini
Google against OpenAI, compared on context, price, and verified benchmark results.
Catalog record checked September 3, 2026Individual provider fields may changeEvidence confidence: High — see receipts below
Gemini 3.5 Flash
Balanced
OpenAI
GPT-5.4 Mini
Balanced
| Specification | Gemini 3.5 Flash | GPT-5.4 Mini |
|---|---|---|
| Provider | OpenAI | |
| Tier | Balanced | Balanced |
| Context window | Winner: 1M | 400K |
| Max output | 64K | Winner: 128K |
| Input / 1M tokens | $1.50 | Winner: $0.75 |
| Output / 1M tokens | $9 | Winner: $4.50 |
| Weights | Closed | Closed |
| Parameters | Not disclosedUnverified | Not disclosedUnverified |
| Reasoning levels | low, medium, high | none, low, medium, high |
| Modalities | text, image, video, audio, pdf | text, image |
| API model id | gemini-3.5-flash | gpt-5.4-mini |
| Released | May 19, 2026 | March 17, 2026 |
| Artificial Analysis Intelligence Index (2026-08-14) | 53 | Not verifiedUnverified |
| Artificial Analysis Intelligence Index [high] (2026-08-14) | Not verifiedUnverified | 46 |
Prices are USD per million tokens at standard rates, excluding batch and caching discounts. Bold indicates the better figure where one is objectively better. Values we could not confirm from the provider are shown as “Not verified” rather than estimated.
Benchmark receipts
- 2026-08-14: Artificial AnalysisComposite index blending reasoning, knowledge, and coding evals into one 0–100 score. Comparability: directly comparable — AA occasionally rebaselines the index scale between snapshots — a score captured on one date is only comparable to same-snapshot scores (check measuredAt).
Pricing tiers: Gemini 3.5 Flash: $1.50/$9.00 per MTok (single aggregator source — verify before publishing). Multimodal input. · GPT-5.4 Mini: Standard $0.75/$4.50 per MTok; cached input $0.075/MTok; batch $0.375/$2.25.
Gemini 3.5 Flash
Gemini 3.5 Flash is Google's agent-focused Flash tier launched at Google I/O 2026.
Best for
- Agentic workflows
- Multimodal input
- High-volume work
Watch out
Price is single-source; confirm on Google Cloud before relying on it.
GPT-5.4 Mini
GPT-5.4 Mini is OpenAI's efficient mid-tier for high-volume, well-scoped tasks at $0.75/$4.50.
Best for
- High-volume calls
- Mixed workloads
- Cost-sensitive production
Watch out
400K context (vs 1.05M on GPT-5.4/5.5/5.6); verify long-context needs.
When the cheaper one wins
GPT-5.4 Mini is cheaper on output at $4.50 per million tokens against $9 for Gemini 3.5 Flash — about 2.0×. Use the cheaper tier for classification, extraction, summarisation, and any task where the expensive model’s extra score does not change the accepted output. The expensive one only pays if your hardest task actually fails on the cheap tier. These are standard-tier API rates, excluding batch and cache discounts.
Run the model pickerEvidence confidence: High
How strong and complete the evidence behind this comparison is — not a prediction of which model is better.
- Pricing verified on both sides — Input and output rates are verified for both models.
- 4/5 core specs verified on both sides — Not published for at least one side: parameter count.
- 1 shared named benchmark with differing scores — Measured on: Artificial Analysis Intelligence Index.
- Verified within the last 90 days — Newest catalog check was 8 days ago.
- Both models carry source citations — Each side has at least two catalog sources on record.
Source receipts
Each catalog figure was checked against the provider or an independent second source on the date shown.
- Gemini 3.5 Flash: Google — Gemini 3.5 Flash (accessed 2026-08-29)
- Gemini 3.5 Flash: Google Cloud Gemini pricing (accessed 2026-08-29)
- GPT-5.4 Mini: OpenAI — GPT-5.4 Mini & Nano (accessed 2026-08-29)
- GPT-5.4 Mini: OpenAI API pricing (gpt-5.4-mini $0.75/$4.50) (accessed 2026-08-29)
Related comparisons
- Amazon Nova 2 Pro vs Gemini 3.5 Flash
- Amazon Nova 2 Pro vs GPT-5.4 Mini
- Claude Sonnet 5 vs Gemini 3.5 Flash
- Claude Sonnet 5 vs GPT-5.4 Mini
- Cohere Command A+ vs Gemini 3.5 Flash
- Cohere Command A+ vs GPT-5.4 Mini
Diving deeper on one model? Gemini 3.5 Flash · GPT-5.4 Mini
Common questions
Gemini 3.5 Flash vs GPT-5.4 Mini
Answered from the verified figures on this page rather than general guidance.
Is Gemini 3.5 Flash or GPT-5.4 Mini cheaper for input?
GPT-5.4 Mini is cheaper at $0.75 per million input tokens, against $1.50 for Gemini 3.5 Flash — roughly 2.0× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; Gemini 3.5 Flash has tiered pricing: $1.50/$9.00 per MTok (single aggregator source — verify before publishing). Multimodal input. GPT-5.4 Mini has tiered pricing: Standard $0.75/$4.50 per MTok; cached input $0.075/MTok; batch $0.375/$2.25.
Is Gemini 3.5 Flash or GPT-5.4 Mini cheaper for output?
GPT-5.4 Mini is cheaper at $4.50 per million output tokens, against $9 for Gemini 3.5 Flash — roughly 2.0× the price. Output tokens usually dominate a real bill, so weigh the output rate more heavily than the input rate. These are base rates; Gemini 3.5 Flash has tiered pricing: $1.50/$9.00 per MTok (single aggregator source — verify before publishing). Multimodal input. GPT-5.4 Mini has tiered pricing: Standard $0.75/$4.50 per MTok; cached input $0.075/MTok; batch $0.375/$2.25.
Which has the larger context window, Gemini 3.5 Flash or GPT-5.4 Mini?
Gemini 3.5 Flash accepts 1M tokens against 400K for GPT-5.4 Mini. This only matters if you routinely send very long documents or large codebases.
Do Gemini 3.5 Flash and GPT-5.4 Mini support the same reasoning levels?
Gemini 3.5 Flash exposes low, medium, high, while GPT-5.4 Mini exposes none, low, medium, high.
Should I use Gemini 3.5 Flash or GPT-5.4 Mini?
Both sit in the balanced tier, so the choice usually comes down to price and context rather than capability. Gemini 3.5 Flash suits agentic workflows; GPT-5.4 Mini suits high-volume calls.
Next step
Choosing between them
The verified figures that separate this pair, computed from the catalog rather than restated boilerplate.
- Input price: GPT-5.4 Mini costs $0.75 per 1M tokens versus $1.50 for Gemini 3.5 Flash — a 2x difference at the headline tier.
- Context: Gemini 3.5 Flash takes 1M against 400K for GPT-5.4 Mini — only decisive if your prompts approach the smaller window.
- Measured capability: Gemini 3.5 Flash leads Artificial Analysis Intelligence Index 53 to 46 (measured 2026-08-14).
Choosing a harness rather than a model — Cursor, Copilot, Claude Code, Windsurf, or Lovable? Compare agentic harnesses · Latest releases.