AI model comparison
Claude Haiku 4.5 vs Gemini 2.5 Flash
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Anthropic
Claude Haiku 4.5
Claude Haiku 4.5 is Anthropic’s fastest and most efficient model, delivering near-frontier intelligence at a fraction of the cost and latency of larger Claude models.
- Input / 1M
- $1
- Output / 1M
- $5
- Context
- 200K
Gemini 2.5 Flash
Gemini 2.5 Flash is Google's state-of-the-art workhorse model, specifically designed for advanced reasoning, coding, mathematics, and scientific tasks.
Gemini 2.5 Flash is scheduled to be retired on October 20, 2026. Consider Gemini 3.8 Flash instead.
- Input / 1M
- $0.30
- Output / 1M
- $2.50
- Context
- 1.05M
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
Gemini 2.5 Flash
2.4x cheaper for a typical chat
Higher intelligence score
Claude Haiku 4.5
16.9 vs 15.5 on Artificial Analysis
Larger context window
Gemini 2.5 Flash
1.05M vs 200K tokens
Newer release
Claude Haiku 4.5
Released October 15, 2025
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Claude Haiku 4.516.9Gemini 2.5 Flash15.5Coding index
Claude Haiku 4.543.9Gemini 2.5 FlashNot availableAgentic index
Claude Haiku 4.58Gemini 2.5 FlashNot availablePricing
Claude Haiku 4.5 vs Gemini 2.5 Flash API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Claude Haiku 4.5 | Gemini 2.5 Flash |
|---|---|---|
| Input tokensPer 1M tokens | $1 | $0.30 |
| Output tokensPer 1M tokens | $5 | $2.50 |
| Cached input (read)Per 1M tokens | $0.10 | $0.03 |
| Cache writePer 1M tokens | $1.25 | $0.08 |
| Web searchPer request | $0.01 | $0.014 |
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
Claude Haiku 4.5$4.50Gemini 2.5 Flash$1.85Coding task
30K in, 4K out
Claude Haiku 4.5$50$23 cachedGemini 2.5 Flash$19$10.90 cachedLong document summary
150K in, 2K out
Claude Haiku 4.5$160$25 cachedGemini 2.5 Flash$50$9.50 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Claude Haiku 4.5 | Gemini 2.5 Flash |
|---|---|---|
| Context window | 200K tokens | 1.05M tokens |
| Max output | 64K tokens | 66K tokens |
| Input types | File, Image, Text | Audio, File, Image, Text, Video |
| Output types | Text | Text |
| Reasoning effort levels | Not available | Not available |
| Default reasoning effort | Not available | Not available |
| Release date | October 15, 2025 | June 17, 2025 |
Features
Supported features
API features available for each model.
| Metric | Claude Haiku 4.5 | Gemini 2.5 Flash |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Not supported | Supported |
| Verbosity control | Not supported | Not supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Claude Haiku 4.5View full model details- Claude Haiku 4.5 vs Gemini 3.1 Flash Lite
- Claude Haiku 4.5 vs Claude Sonnet 4.5
- Claude Haiku 4.5 vs Gemini 2.5 Pro
- Claude Haiku 4.5 vs GLM 4.6
- Claude Haiku 4.5 vs o3
- Claude Haiku 4.5 vs Claude Sonnet 4
- Claude Haiku 4.5 vs Qwen3.5-122B-A10B
- Claude Haiku 4.5 vs o4 Mini
- Claude Haiku 4.5 vs Kimi K2 0905
- Claude Haiku 4.5 vs o1
- Claude Haiku 4.5 vs Mistral Medium 3.5
- Claude Haiku 4.5 vs Command A
- Claude Haiku 4.5 vs o3 Mini
- Claude Haiku 4.5 vs Sonar Reasoning Pro
Gemini 2.5 FlashView full model details- Gemini 2.5 Flash vs Step 5 Preview
- Gemini 2.5 Flash vs Gemini 3.1 Flash Lite
- Gemini 2.5 Flash vs Gemma 4 31B
- Gemini 2.5 Flash vs Gemma 4 26B A4B
- Gemini 2.5 Flash vs Gemini 3.5 Flash Lite
- Gemini 2.5 Flash vs Gemini 2.5 Pro
- Gemini 2.5 Flash vs Muse Glimmer 30B
- Gemini 2.5 Flash vs GLM 4.6
- Gemini 2.5 Flash vs R1 0528
- Gemini 2.5 Flash vs Qwen3.5-122B-A10B
- Gemini 2.5 Flash vs Kimi K2 0905
- Gemini 2.5 Flash vs Mistral Medium 3.5
- Gemini 2.5 Flash vs o4 Mini
- Gemini 2.5 Flash vs DeepSeek V3.1 Terminus
- Gemini 2.5 Flash vs Nova 2 Lite
- Gemini 2.5 Flash vs Command A
- Gemini 2.5 Flash vs GLM 4.5
- Gemini 2.5 Flash vs Kimi K2 0711
- Gemini 2.5 Flash vs Qwen3 235B A22B Thinking 2507
- Gemini 2.5 Flash vs o3 Mini
- Gemini 2.5 Flash vs MiniMax M1
- Gemini 2.5 Flash vs R1
Our take
Gemini 2.5 Flash is 2.4x cheaper for a typical chat. Claude Haiku 4.5 scores higher on the Artificial Analysis Intelligence Index (16.9 vs 15.5). Gemini 2.5 Flash 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 Claude Haiku 4.5 or Gemini 2.5 Flash cheaper?
Gemini 2.5 Flash is cheaper for a typical chat (2K input tokens and 500 output tokens). Gemini 2.5 Flash costs $0.30 per 1M input tokens and $2.50 per 1M output tokens, while Claude Haiku 4.5 costs $1 per 1M input tokens and $5 per 1M output tokens.
Which has a bigger context window, Claude Haiku 4.5 or Gemini 2.5 Flash?
Gemini 2.5 Flash supports up to 1.05M tokens of context, compared with 200K for Claude Haiku 4.5.
Is Claude Haiku 4.5 smarter than Gemini 2.5 Flash?
On the Artificial Analysis Intelligence Index, Claude Haiku 4.5 scores 16.9 and Gemini 2.5 Flash scores 15.5, putting Claude Haiku 4.5 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use Claude Haiku 4.5 and Gemini 2.5 Flash at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see Claude Haiku 4.5 and Gemini 2.5 Flash answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to Claude Haiku 4.5 and Gemini 2.5 Flash at the same time. Compare the answers side by side and keep the best one.