Claude Haiku 4.5 vs GPT-5 Mini
Claude Haiku 4.5 (2025) and GPT-5 Mini (2025) are frontier reasoning models from Anthropic and OpenAI. Claude Haiku 4.5 ships a 200k-token context window, while GPT-5 Mini ships a 400K-token context window. On BFCL, Claude Haiku 4.5 leads by 13.2 pts. On pricing, GPT-5 Mini costs $0.25/1M input tokens versus $0.8/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
GPT-5 Mini is ~220% cheaper at $0.25/1M; pay for Claude Haiku 4.5 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Claude Haiku 4.5 | GPT-5 Mini |
|---|---|---|
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 200k | 400K |
| Cheapest output | $4/1M tokens | $2/1M tokens |
| Provider routes | 7 tracked | 3 tracked |
| Shared benchmarks | BFCL leader | 1 rows |
Decision tradeoffs
- Claude Haiku 4.5 leads the largest shared benchmark signal on BFCL by 13.2 points.
- Claude Haiku 4.5 has broader tracked provider coverage for fallback and procurement flexibility.
- Local decision data tags Claude Haiku 4.5 for Coding, RAG, and Agents.
- GPT-5 Mini has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5 Mini has the lower cheapest tracked output price at $2/1M tokens.
- GPT-5 Mini uniquely exposes Reasoning in local model data.
- Local decision data tags GPT-5 Mini for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
Claude Haiku 4.5
$1,640
Cheapest tracked route: AWS Bedrock
GPT-5 Mini
$700
Cheapest tracked route: Replicate API
Estimated monthly gap: $940. Batch, cache, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on Replicate API and OpenRouter; start route-level A/B tests there.
- GPT-5 Mini is $2/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- GPT-5 Mini adds Reasoning in local capability data.
- Provider overlap exists on OpenRouter and Replicate API; start route-level A/B tests there.
- Claude Haiku 4.5 is $2/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Reasoning before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-10-01 | 2025-08-07 |
| Context window | 200k | 400K |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-02 | 2024-05 |
Pricing and availability
| Pricing attribute | Claude Haiku 4.5 | GPT-5 Mini |
|---|---|---|
| Input price | $0.8/1M tokens | $0.25/1M tokens |
| Output price | $4/1M tokens | $2/1M tokens |
| Providers |
Capabilities
| Capability | Claude Haiku 4.5 | GPT-5 Mini |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
Benchmarks
| Benchmark | Claude Haiku 4.5 | GPT-5 Mini |
|---|---|---|
| BFCL | 68.7 | 55.5 |
Deep dive
On shared benchmark coverage, BFCL has Claude Haiku 4.5 at 68.7 and GPT-5 Mini at 55.5, with Claude Haiku 4.5 ahead by 13.2 points. The largest visible gap is 13.2 points on BFCL, 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 reasoning mode: GPT-5 Mini. Both models share vision, multimodal input, function calling, and tool use, 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 Haiku 4.5 lists $0.8/1M input and $4/1M output tokens, while GPT-5 Mini lists $0.25/1M input and $2/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts GPT-5 Mini lower by about $0.98 per million blended tokens. Availability is 7 providers versus 3, so concentration risk also matters.
Choose Claude Haiku 4.5 when coding workflow support and broader provider choice are central to the workload. Choose GPT-5 Mini 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 Haiku 4.5 or GPT-5 Mini?
GPT-5 Mini supports 400K tokens, while Claude Haiku 4.5 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 Haiku 4.5 or GPT-5 Mini?
GPT-5 Mini is cheaper on tracked token pricing. Claude Haiku 4.5 costs $0.8/1M input and $4/1M output tokens. GPT-5 Mini costs $0.25/1M input and $2/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Haiku 4.5 or GPT-5 Mini open source?
Claude Haiku 4.5 is listed under Proprietary. GPT-5 Mini 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 Haiku 4.5 or GPT-5 Mini?
Both Claude Haiku 4.5 and GPT-5 Mini expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for multimodal input, Claude Haiku 4.5 or GPT-5 Mini?
Both Claude Haiku 4.5 and GPT-5 Mini expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Claude Haiku 4.5 and GPT-5 Mini?
Claude Haiku 4.5 is available on Microsoft Foundry, Anthropic, Snowflake Cortex, AWS Bedrock, and GCP Vertex AI. GPT-5 Mini is available on Replicate API, OpenRouter, and OpenAI API. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-19. Data sourced from public model cards and provider documentation.