AI model comparison
Gemini 3 Flash Preview vs Claude Opus 4.5
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Gemini 3 Flash Preview is a high speed, high value thinking model designed for agentic workflows, multi turn chat, and coding assistance.
- Input / 1M
- $0.50
- Output / 1M
- $3
- Context
- 1.05M
Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use.
- Input / 1M
- $5
- Output / 1M
- $25
- Context
- 200K
Comparing image generators? Compare image models
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Gemini 3 Flash Preview
9x cheaper for a typical chat
Higher intelligence score
Claude Opus 4.5
29.1 vs 26.3 on Artificial Analysis
Larger context window
Gemini 3 Flash Preview
1.05M vs 200K tokens
Newer release
Gemini 3 Flash Preview
Released December 17, 2025
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Gemini 3 Flash Preview26.3Claude Opus 4.529.1Coding index
Gemini 3 Flash PreviewNot availableClaude Opus 4.5Not availableAgentic index
Gemini 3 Flash PreviewNot availableClaude Opus 4.5Not availablePricing
Gemini 3 Flash Preview vs Claude Opus 4.5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Gemini 3 Flash Preview | Claude Opus 4.5 |
|---|---|---|
| Input tokensPer 1M tokens | $0.50 | $5 |
| Output tokensPer 1M tokens | $3 | $25 |
| Cached input (read)Per 1M tokens | $0.05 | $0.50 |
| Cache writePer 1M tokens | $0.08 | $6.25 |
| Web searchPer request | $0.014 | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
Gemini 3 Flash Preview$2.50Claude Opus 4.5$22.50Coding task
30K in, 4K out
Gemini 3 Flash Preview$27$13.50 cachedClaude Opus 4.5$250$115 cachedLong document summary
150K in, 2K out
Gemini 3 Flash Preview$81$13.50 cachedClaude Opus 4.5$800$125 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Gemini 3 Flash Preview | Claude Opus 4.5 |
|---|---|---|
| Context window | 1.05M tokens | 200K tokens |
| Max output | 66K tokens | 64K tokens |
| Input types | Audio, File, Image, Text, Video | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | High, Medium, Low, Minimal, None | Not available |
| Default reasoning effort | Medium | Not available |
| Release date | December 17, 2025 | November 24, 2025 |
Features
Supported features
API features available for each model.
| Metric | Gemini 3 Flash Preview | Claude Opus 4.5 |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Supported | Not supported |
| Verbosity control | Not supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Gemini 3 Flash PreviewView full model details- Gemini 3 Flash Preview vs DeepSeek V4.1 Flash
- Gemini 3 Flash Preview vs Hy4 preview
- Gemini 3 Flash Preview vs MiniMax M3
- Gemini 3 Flash Preview vs Gemini 3.5 Flash Lite
- Gemini 3 Flash Preview vs MiMo-V2.5-Pro
- Gemini 3 Flash Preview vs Gemini 3.1 Pro Preview
- Gemini 3 Flash Preview vs GPT-5.4 Mini
- Gemini 3 Flash Preview vs Gemini 3.6 Flash
- Gemini 3 Flash Preview vs Kimi K2.6
- Gemini 3 Flash Preview vs Qwen3.7 Max
- Gemini 3 Flash Preview vs GLM 5
- Gemini 3 Flash Preview vs Qwen3.7 Plus
- Gemini 3 Flash Preview vs Grok Build 0.1
- Gemini 3 Flash Preview vs Qwen3.6 Plus
- Gemini 3 Flash Preview vs Kimi K2.7 Code
- Gemini 3 Flash Preview vs GLM 5 Turbo
- Gemini 3 Flash Preview vs GLM 5.1
- Gemini 3 Flash Preview vs Grok 4.20
- Gemini 3 Flash Preview vs Inkling Small
- Gemini 3 Flash Preview vs Inkling
- Gemini 3 Flash Preview vs Grok 4.3
- Gemini 3 Flash Preview vs GPT-5.1
- Gemini 3 Flash Preview vs GPT-5.1-Codex
- Gemini 3 Flash Preview vs Kimi K2.5
- Gemini 3 Flash Preview vs Qwen3.5 397B A17B
- Gemini 3 Flash Preview vs GLM 5V Turbo
- Gemini 3 Flash Preview vs GPT-5
- Gemini 3 Flash Preview vs Nemotron 3 Ultra
- Gemini 3 Flash Preview vs Qwen3.5-27B
Claude Opus 4.5View full model details- Claude Opus 4.5 vs Claude Sonnet 5
- Claude Opus 4.5 vs GPT-5.3-Codex
- Claude Opus 4.5 vs Claude Opus 4.6
- Claude Opus 4.5 vs GPT-5.2
- Claude Opus 4.5 vs Claude Sonnet 4.6
- Claude Opus 4.5 vs Gemini 3.1 Pro Preview
- Claude Opus 4.5 vs Qwen3.7 Max
- Claude Opus 4.5 vs GPT-5.2-Codex
- Claude Opus 4.5 vs Claude Opus 4.1
- Claude Opus 4.5 vs Claude Sonnet 4.5
Our take
Gemini 3 Flash Preview is 9x cheaper for a typical chat. Claude Opus 4.5 scores higher on the Artificial Analysis Intelligence Index (29.1 vs 26.3). Gemini 3 Flash Preview has the larger context window (1.05M vs 200K tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is Gemini 3 Flash Preview or Claude Opus 4.5 cheaper?
Gemini 3 Flash Preview is cheaper for a typical chat (2K input tokens and 500 output tokens). Gemini 3 Flash Preview costs $0.50 per 1M input tokens and $3 per 1M output tokens, while Claude Opus 4.5 costs $5 per 1M input tokens and $25 per 1M output tokens.
Which has a bigger context window, Gemini 3 Flash Preview or Claude Opus 4.5?
Gemini 3 Flash Preview supports up to 1.05M tokens of context, compared with 200K for Claude Opus 4.5.
Is Gemini 3 Flash Preview smarter than Claude Opus 4.5?
On the Artificial Analysis Intelligence Index, Gemini 3 Flash Preview scores 26.3 and Claude Opus 4.5 scores 29.1, putting Claude Opus 4.5 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Gemini 3 Flash Preview and Claude Opus 4.5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Gemini 3 Flash Preview and Claude Opus 4.5 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Gemini 3 Flash Preview and Claude Opus 4.5 at the same time. Compare the answers side by side and keep the best one.