Claude Haiku 4.5 vs GPT-5.4
Claude Haiku 4.5 (2025) and GPT-5.4 (2026) are frontier reasoning models from Anthropic and OpenAI. Claude Haiku 4.5 ships a 200k-token context window, while GPT-5.4 ships a not-yet-sourced context window. On MultiChallenge, GPT-5.4 leads by 18.7 pts. On pricing, Claude Haiku 4.5 costs $0.8/1M input tokens versus $2.5/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Claude Haiku 4.5 is ~213% cheaper at $0.8/1M; pay for GPT-5.4 only for coding workflow support.
Specs
| Released | 2025-10-01 | 2026-03-05 |
| Context window | 200k | — |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-02 | 2025-08 |
Pricing and availability
| Claude Haiku 4.5 | GPT-5.4 | |
|---|---|---|
| Input price | $0.8/1M tokens | $2.5/1M tokens |
| Output price | $4/1M tokens | $15/1M tokens |
| Providers |
Capabilities
| Claude Haiku 4.5 | GPT-5.4 | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
| Benchmark | Claude Haiku 4.5 | GPT-5.4 |
|---|---|---|
| MultiChallenge | 50.5 | 69.2 |
Deep dive
On shared benchmark coverage, MultiChallenge has Claude Haiku 4.5 at 50.5 and GPT-5.4 at 69.2, with GPT-5.4 ahead by 18.7 points. The largest visible gap is 18.7 points on MultiChallenge, 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 vision: Claude Haiku 4.5 and reasoning mode: GPT-5.4. Both models share multimodal input, function calling, tool use, and structured outputs, 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-5.4 lists $2.5/1M input and $15/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Claude Haiku 4.5 lower by about $4.49 per million blended tokens. Availability is 8 providers versus 2, so concentration risk also matters.
Choose Claude Haiku 4.5 when coding workflow support, lower input-token cost, and broader provider choice are central to the workload. Choose GPT-5.4 when coding workflow support are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which is cheaper, Claude Haiku 4.5 or GPT-5.4?
Claude Haiku 4.5 is cheaper on tracked token pricing. Claude Haiku 4.5 costs $0.8/1M input and $4/1M output tokens. GPT-5.4 costs $2.5/1M input and $15/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Haiku 4.5 or GPT-5.4 open source?
Claude Haiku 4.5 is listed under Proprietary. GPT-5.4 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-5.4?
Claude Haiku 4.5 has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, Claude Haiku 4.5 or GPT-5.4?
Both Claude Haiku 4.5 and GPT-5.4 expose multimodal input. 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 reasoning mode, Claude Haiku 4.5 or GPT-5.4?
GPT-5.4 has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Claude Haiku 4.5 and GPT-5.4?
Claude Haiku 4.5 is available on Microsoft Foundry, Anthropic, Snowflake Cortex, AWS Bedrock, and GCP Vertex AI. GPT-5.4 is available on OpenAI API and OpenRouter. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-04-24. Data sourced from public model cards and provider documentation.