Claude 3.5 Haiku vs Gemini 2.5 Flash
Claude 3.5 Haiku (2024) and Gemini 2.5 Flash (2025) are frontier reasoning models from Anthropic and Google DeepMind. Claude 3.5 Haiku ships a 200K-token context window, while Gemini 2.5 Flash ships a 1M-token context window. On LMArena Text Arena - Creative Writing, Gemini 2.5 Flash leads by 168 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Gemini 2.5 Flash is ~167% cheaper at $0.30/1M; pay for Claude 3.5 Haiku only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Claude 3.5 Haiku | Gemini 2.5 Flash |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and provider-routed production | multimodal apps, tool-calling agents, and long-context analysis |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 200K | 1M |
| Cheapest output | $4/1M tokens | $2.50/1M tokens |
| Provider routes | 6 tracked | 6 tracked |
| Shared benchmarks | 1 shared | LMArena Text Arena - Creative Writing leader |
Decision tradeoffs
- Claude 3.5 Haiku uniquely exposes Reasoning in local model data.
- Local decision data tags Claude 3.5 Haiku for Coding, RAG, and Agents.
- Gemini 2.5 Flash holds a shared-benchmark lead on LMArena Text Arena - Creative Writing, ahead by 168 points.
- Gemini 2.5 Flash has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 2.5 Flash has the lower cheapest tracked output price at $2.50/1M tokens.
- Gemini 2.5 Flash uniquely exposes Multimodal and JSON / Tool use in local model data.
- Local decision data tags Gemini 2.5 Flash for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude 3.5 Haiku
$1,640
Cheapest tracked route/tier: Anthropic
Gemini 2.5 Flash
$865
Cheapest tracked route/tier: Google AI Studio
Estimated monthly gap: $775. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on GCP Vertex AI, Replicate API, and OpenRouter; start route-level A/B tests there.
- Gemini 2.5 Flash is $1.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning before moving production traffic.
- Gemini 2.5 Flash adds Multimodal and JSON / Tool use in local capability data.
- Provider overlap exists on OpenRouter, GCP Vertex AI, and Replicate API; start route-level A/B tests there.
- Claude 3.5 Haiku is $1.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Multimodal and JSON / Tool use before moving production traffic.
- Claude 3.5 Haiku adds Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-10-22 | 2025-06-17 |
| Context window | 200K | 1M |
| Parameters | — | — |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Restricted | Restricted |
| Knowledge cutoff | - | 2025-01 |
Pricing and availability
| Pricing attribute | Claude 3.5 Haiku | Gemini 2.5 Flash |
|---|---|---|
| Input price | $0.80/1M tokens | $0.30/1M tokens |
| Output price | $4/1M tokens | $2.50/1M tokens |
| Providers |
Capabilities
| Capability | Claude 3.5 Haiku | Gemini 2.5 Flash |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | No | Yes |
| Reasoning | Yes | No |
| JSON / Tool use | No | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude 3.5 Haiku | Gemini 2.5 Flash |
|---|---|---|
| LMArena Text Arena - Creative Writing | 1232.0 | 1400.0 |
Deep dive
On shared benchmark coverage, LMArena Text Arena - Creative Writing has Claude 3.5 Haiku at 1232 and Gemini 2.5 Flash at 1400, with Gemini 2.5 Flash ahead by 168 points. The largest visible gap is 168 points on LMArena Text Arena - Creative Writing, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on multimodal input: Gemini 2.5 Flash, reasoning mode: Claude 3.5 Haiku, JSON / Tool use: Gemini 2.5 Flash, and JSON / Tool use: Gemini 2.5 Flash. Both models share vision, structured outputs, and code execution, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude 3.5 Haiku lists $0.80/1M input and $4/1M output tokens on the cheapest listed provider, while Gemini 2.5 Flash lists $0.30/1M input and $2.50/1M output tokens on the cheapest listed provider. A 70/30 input-output blend puts Gemini 2.5 Flash lower by about $0.80 per million blended tokens. Availability is 6 providers versus 6, so concentration risk also matters.
Choose Claude 3.5 Haiku when coding workflow support are central to the workload. Choose Gemini 2.5 Flash when coding workflow support, larger context windows, and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Claude 3.5 Haiku or Gemini 2.5 Flash?
Gemini 2.5 Flash supports 1M tokens, while Claude 3.5 Haiku supports 200K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Claude 3.5 Haiku or Gemini 2.5 Flash?
Gemini 2.5 Flash is cheaper on listed token pricing. Claude 3.5 Haiku costs $0.80/1M input and $4/1M output tokens. Gemini 2.5 Flash costs $0.30/1M input and $2.50/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude 3.5 Haiku or Gemini 2.5 Flash open source?
Claude 3.5 Haiku is listed under Proprietary. Gemini 2.5 Flash is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude 3.5 Haiku or Gemini 2.5 Flash?
Both Claude 3.5 Haiku and Gemini 2.5 Flash expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Claude 3.5 Haiku or Gemini 2.5 Flash?
Gemini 2.5 Flash has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Claude 3.5 Haiku and Gemini 2.5 Flash?
Claude 3.5 Haiku is available on Anthropic, OpenRouter, AWS Bedrock, GCP Vertex AI, and Replicate API. Gemini 2.5 Flash is available on Google AI Studio, GCP Vertex AI, Replicate API, OpenRouter, and Vercel AI Gateway. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-11-03. Data sourced from public model cards and provider documentation.