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 $0.80/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
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 |
|---|---|---|
| Best for | multimodal apps, tool-calling agents, and provider-routed production | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 200k | 400k |
| Cheapest output | $4/1M tokens | $2/1M tokens |
| Provider routes | 9 tracked | 4 tracked |
| Shared benchmarks | BFCL leader | 1 shared |
Decision tradeoffs
- Claude Haiku 4.5 holds a shared-benchmark lead on BFCL, ahead by 13.2 points.
- Claude Haiku 4.5 has broader tracked provider coverage for fallback and route 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 route or tier on this page.
Claude Haiku 4.5
$1,640
Cheapest tracked route/tier: AWS Bedrock
GPT-5 Mini
$700
Cheapest tracked route/tier: Replicate API
Estimated monthly gap: $940. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on Replicate API, OpenRouter, and Vercel AI Gateway; 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, Replicate API, and Vercel AI Gateway; 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 |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | 2025-02 | 2024-05 |
Pricing and availability
| Pricing attribute | Claude Haiku 4.5 | GPT-5 Mini |
|---|---|---|
| Input price | $0.80/1M 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 |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude Haiku 4.5 | GPT-5 Mini |
|---|---|---|
| BFCL | 68.7 | 55.5 |
Continue comparing
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.