Claude Haiku 4.5 vs Gemini 3.1 Pro
Anthropic's Claude Haiku 4.5 and Google's Gemini 3.1 Pro both target production language workloads, but they price and behave differently. Here is the side-by-side.
Pricing checked against provider documentation on . How we verify
The short answer
Claude Haiku 4.5 is the cheaper option — roughly 2.3x less on a blended workload, and it suits lowest-latency claude responses. Gemini 3.1 Pro justifies its premium when you need best price-to-reasoning ratio.
Anthropic • Claude 4.5
$1.00 / $5.00
/ 1M tokens (input / output)
The fastest model Anthropic ships, still on the Claude 4.5 generation with a 200K window and an early-2025 knowledge cutoff. Worth it when response latency is the product requirement; otherwise Sonnet 5 offers more capability and five times the context for twice the price.
Google • Gemini 3.1
$2.00 / $12.00
/ 1M tokens (input / output)
Google's shipping flagship while 3.5 Pro remains unreleased, and the cheapest frontier model by a wide margin. It still tops several hard-reasoning boards including GPQA Diamond and ARC-AGI-2, making it the value choice for research-style workloads — provided you keep prompts under 200K tokens, where the price doubles.
Input price
Gemini 3.1 Pro is 2.0x the price than Claude Haiku 4.5 on input tokens.
Output price
Gemini 3.1 Pro is 2.4x the price than Claude Haiku 4.5 on output tokens — usually the side that dominates the bill.
Monthly cost at three workload sizes
Standard (non-batch, non-cached) rates. Reasoning models will exceed these figures because thinking tokens bill as output.
| Workload | Claude Haiku 4.5 | Gemini 3.1 Pro | Difference |
|---|---|---|---|
| Light — 1M in / 200K out | $2 | $4 | $2 |
| Moderate — 10M in / 2M out | $20 | $44 | $24 |
| Heavy — 100M in / 20M out | $200 | $440 | $240 |
Specification comparison
| Attribute | Claude Haiku 4.5 | Gemini 3.1 Pro |
|---|---|---|
| Input (/ 1M tokens) | $1.00 | $2.00 |
| Output (/ 1M tokens) | $5.00 | $12.00 |
| Cached input | $0.10 | — |
| Context window | 200,000 tokens | 1,048,576 tokens |
| Max output | 64,000 tokens | 65,536 tokens |
| Native reasoning | Yes | Yes |
| Knowledge cutoff | 2025-02 | 2025-06 |
| Relative latency | low | medium |
| Open weights | No | No |
| API model ID | claude-haiku-4-5 | gemini-3.1-pro-preview |
| Status | stable | preview |
Gemini 3.1 Pro: Prompts over 200K tokens reprice to $4 input / $18 output per 1M.
Choose Claude Haiku 4.5 if…
- Real-time chat suggestions
- Lightweight extraction and tagging
- Guardrail and routing calls
- High-frequency background jobs
Choose Gemini 3.1 Pro if…
- Hard reasoning and research tasks
- Long-context document and video analysis
- Native multimodal pipelines
- Cost-conscious frontier workloads
Frequently asked
Is Claude Haiku 4.5 or Gemini 3.1 Pro cheaper?
Claude Haiku 4.5 is cheaper. On a blended 3:1 input-to-output workload it costs about 2.3x less than Gemini 3.1 Pro.
Which has the larger context window, Claude Haiku 4.5 or Gemini 3.1 Pro?
Gemini 3.1 Pro has the larger window at 1.05M tokens versus 200K.
Should I use Claude Haiku 4.5 or Gemini 3.1 Pro?
Pick Claude Haiku 4.5 for lowest-latency claude responses. Pick Gemini 3.1 Pro for best price-to-reasoning ratio. If cost dominates the decision, Claude Haiku 4.5 wins; if you need the capability ceiling, benchmark both on your own evals before committing.