Gemini 3.6 Flash vs o3 Mini High: which should you choose in 2026?
Gemini 3.6 Flash (by Google) and o3 Mini High (by OpenAI) are compared below. Here is how they stack up on benchmarks, price, and capabilities, and which one to pick in 2026.
There are not enough shared, protocol-compatible benchmark results to declare a performance leader.
Gemini 3.6 Flash is about 1.3× cheaper on a blended 3:1 input/output basis ($1.50 vs $1.93 per 1M tokens).
Gemini 3.6 Flash has the larger context window (1,048,576 tokens vs 200,000 tokens).
Choose Gemini 3.6 Flash if…
- • lower blended API cost matters for your workload
- • you work with longer documents, transcripts, or codebases
- • you need image inputs
Choose o3 Mini High if…
- • your own prompt tests favor its output; shared comparable evidence does not identify a unique advantage
The benchmark count includes only results measured with a matching benchmark version and protocol. Arena scores are shown separately. Missing, preliminary, and incompatible data is not treated as a controlled win. Published point-score comparisons are labeled separately when protocol details are incomplete. For text-output models, the verdict also compares token pricing and context windows.
Performance benchmarks
Every value links to its source. A dash means that no reviewed result is available for that exact model and protocol.
| Benchmark | Gemini 3.6 Flash | o3 Mini High |
|---|---|---|
A 657-task benchmark of multi-step work across simulated SaaS applications in six business domains. The Artificial Analysis protocol reports a guardrail-aware score and is distinct from both the public Zapier split and the unrelated dynamic AutoBench framework. Guardrail-aware score | 51.1% Artificial Analysis | — |
A benchmark of difficult, verifiable information-seeking questions designed to measure an agent's ability to locate hard-to-find facts through web browsing. Accuracy | — | — |
A verified computer-use benchmark in which multimodal agents operate desktop applications and are graded from the resulting environment state. Mean task reward | — | — |
A long-horizon software-engineering benchmark with 113 original tasks graded by hand-written tests. Pass@1 | 49.0%±5.0 DataCurve | — |
A human-validated subset of real GitHub issues used to measure whether a coding agent can produce repository patches that resolve the associated tests. Resolved | — | — |
Version 2.1 of the benchmark for completing realistic tasks in terminal environments. Harness, resource limits, and attempt count are part of the protocol. Mean task success | — | — |
A dynamic LLM evaluation framework in which models generate questions, answer them, and participate in reciprocal peer assessment. AutoBench is distinct from Zapier's AutomationBench. Weighted peer-assessment score | — | — |
The highest-quality subset of Graduate-Level Google-Proof Q&A, designed to test expert-level scientific reasoning in biology, physics, and chemistry. Accuracy | 92.8% Artificial Analysis | — |
A 2,500-question expert-level benchmark spanning dozens of academic fields. Tool-assisted and no-tools results are separate protocols and must not be merged. Accuracy | 40.8% Artificial Analysis | — |
A contamination-resistant benchmark refreshed on a fixed release cadence. Scores from different LiveBench releases must never be compared as the same protocol. Mean of category averages | 73.6% LiveBench | — |
| Arena preference scores | ||
Human preference score | — | 1364 ±5 |
Benchmark sources
- Arena AI leaderboard
- AutomationBench-AA: Agentic SaaS Workflow Benchmark
- DeepSWE 1.1 Leaderboard
- GPQA Diamond Benchmark Leaderboard
- Humanity's Last Exam Benchmark Leaderboard
- LiveBench 2026-06-25 Leaderboard
Reviewed evidence last updated 2026-08-09. Arena data last refreshed Aug 23, 2026.
Pricing, capabilities, and model facts
| Feature | Gemini 3.6 Flash | o3 Mini High |
|---|---|---|
| Context & model facts | ||
| Developer | OpenAI | |
| API provider | OpenAI | |
| Input context | 1,048,576 tokens | 200,000 tokens |
| Maximum output | 65,536 tokens | 100,000 tokens |
| Released | — | — |
| Added to Writingmate | Jul 21, 2026 | Feb 12, 2025 |
| License | Not available | Not available |
| Knowledge cutoff | — | 2023-10-31 |
| Capabilities | ||
| Inputs | Text, Image, Video, File, Audio | Text, File |
| Outputs | Text | Text |
| Provider endpoint accepts tool parameters | Yes | Yes |
| Reasoning | Yes | Yes |
| Vision | Yes | No |
| Image Generation | No | No |
| Video Generation | No | No |
| API pricing | ||
| Input (per 1M tokens) | $0.75 | $1.10 |
| Output (per 1M tokens) | $3.75 | $4.40 |
| Blended 3:1 input/output | $1.50 | $1.93 |
| API performance | ||
| p95 latency | Not measured | Not measured |
| Output throughput | Not measured | Not measured |
| Writingmate shows API performance only when both models have enough observations from the same measurement window, prompt profile, and provider. Third-party latency values are not copied into this table. | ||
Data sources
- Writingmate model catalog (pricing, limits, and availability)
Catalog data last updated Jul 21, 2026.
Why Pay for Multiple Subscriptions?
Comparing Gemini 3.6 Flash from Google with o3 Mini High from OpenAI? Instead of managing separate API keys and subscriptions, get both with Writingmate.
| Plan | Price | Gemini 3.6 Flash | o3 Mini High | AI Images | AI Video |
|---|---|---|---|---|---|
Writingmate Pro Most popular | $20/mo | Included | Included | Nano Banana Pro, FLUX.2, DALL-E & more | Sora 2, VEO 3.1 |
Writingmate Ultimate Power users | $60/mo | Included | Included | Nano Banana Pro, FLUX.2, DALL-E & more | Sora 2, VEO 3.1 |
Gemini 3.6 Flash vs o3 Mini High FAQ
Which is better, Gemini 3.6 Flash or o3 Mini High?
There are not enough shared, protocol-compatible benchmark results to declare a performance leader. Gemini 3.6 Flash is about 1.3× cheaper on a blended 3:1 input/output basis ($1.50 vs $1.93 per 1M tokens). Gemini 3.6 Flash has the larger context window (1,048,576 tokens vs 200,000 tokens).
Which model is cheaper to use through an API?
Gemini 3.6 Flash is about 1.3× cheaper on a blended 3:1 input/output basis ($1.50 vs $1.93 per 1M tokens).
Which model supports more context?
Gemini 3.6 Flash has the larger context window (1,048,576 tokens vs 200,000 tokens).
Can I switch between Gemini 3.6 Flash and o3 Mini High?
Yes. Use the model selector on this page to open any current Writingmate model comparison. You can also run the same prompt with both models in Writingmate.
Related comparisons
More Gemini 3.6 Flash comparisons
Muse Spark 1.2 Contributor
Meta
Muse Spark 1.2 contributor tier is a reasoning model from Meta designed for developers who want to start building at an even lower cost.
Muse Spark 1.2
Meta
Muse Spark 1.2 is a reasoning model from Meta, designed for complex agentic tasks.
Muse Spark 1.1
Meta
Muse Spark 1.1 is a multimodal reasoning model from Meta, built for agentic tasks.
MiMo-V2.5
Xiaomi
MiMo-V2.5 is a native omnimodal model by Xiaomi.
Nova 2 Lite
Amazon
Nova 2 Lite is a fast, cost-effective reasoning model for everyday workloads that can process text, images, and videos to generate text.
Ox Alpha
Stealth
Ox Alpha is a reasoning model designed for coding, sustained agentic work, and production workloads.
More o3 Mini High comparisons
Muse Spark 1.2 Contributor
Meta
Muse Spark 1.2 contributor tier is a reasoning model from Meta designed for developers who want to start building at an even lower cost.
Gemini 3.7 Flash
Gemini 3.7 Flash is a multimodal model from Google for fast agentic workflows, coding, and complex multi-step reasoning.
Grok 4.6
xAI
Grok 4.6 is SpaceXAI's smartest model with frontier performance on coding, knowledge work, and STEM.
Sakana Namazu
Sakana AI
Sakana Namazu is a Japanese-specialized reasoning model from Sakana AI, based on Kimi K2.6 with additional training for Japanese language and business contexts.
Muse Spark 1.2
Meta
Muse Spark 1.2 is a reasoning model from Meta, designed for complex agentic tasks.
Claude Opus 5
Anthropic
Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work.