GPT-4.5
GPT-4.5 is a legacy integration reference; evaluate GPT-4.1 before starting new work.
Use it for
- Teams maintaining an existing integration
- Workloads that can use a 8k context window
- Buyers comparing 2 tracked provider routes
Do not use it for
- New production launches
- Family
- GPT-4.5
- Released
- 2025-02-27
- Context
- 8k
- Knowledge cutoff
- 2025-04
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
Cheapest of 2 routes · Azure OpenAI
This model is deprecated. OpenAI recommends switching to GPT-4.1.
About
Improved GPT-4 variant released March 2026. Enhanced performance over GPT-4o with better reasoning and code generation.
GPT-4.5 is a proprietary model. The structured metadata tracks a 8k-token context window, multimodal input, function calling, tool use, structured outputs, and code execution. This page tracks provider routes through OpenAI API and Azure OpenAI. Headline tracked benchmarks include MMLU PRO 86.1 and Google-Proof Q&A 71.4.
Top use-case fit: coding, agents, and build tasks
Coding
Included by capability and metadata signals in the decision map.
Agents
Included by capability and metadata signals in the decision map.
Vision
Included by capability and metadata signals in the decision map.
Provider price ladder
Compare all 2Compare API pricing across 2 providers for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Route |
|---|---|---|---|
| Azure OpenAI | - | - | ServerlessPartial |
| OpenAI API | - | - | ServerlessPartial |
Available via routers & gateways(16)
LiteLLM
GatewayOpen-source Python SDK and proxy server that unifies 100+ LLM APIs behind a single OpenAI-compatible interface, with load balancing, cost tracking, and configurable failover.
OpenRouter
HybridUnified hybrid gateway to 400+ models from 60+ providers via a single OpenAI-compatible API, with optional auto-routing that selects the best model per prompt.
Portkey
GatewayProduction AI gateway routing to 1,600+ LLMs with failover, load balancing, semantic caching, and guardrails; Apache 2.0 core is fully self-hostable with the complete feature set.
AIRouter
RouterCommercial LLM router that analyzes incoming requests and routes to the optimal model for cost/quality/latency via a drop-in OpenAI-compatible API, with a privacy-preserving embedding mode that avoids sending prompt content.
Azure AI Foundry Model Router
RouterMicrosoft Azure AI Foundry's native model router that uses a trained ML model to route each prompt in real time to the optimal Azure-hosted model, with Balanced/Cost/Quality mode selection and automatic failover.
Helicone
GatewayObservability-first AI gateway with routing, caching, rate limiting, and request tracing; Apache 2.0 open-source core with a managed hosted tier for logging and analytics.
Capabilities
Benchmark peer barsfor Classification
Benchmark scores(2)
| Benchmark | Score | Version | Source |
|---|---|---|---|
| MMLU PRO | 86.1 | — | https://huggingface.co/spaces/TIGER-Lab/MMLU-Pro |
| Google-Proof Q&A | 71.4 | — | https://openai.com/blog/gpt-4-5 |
Migration checks
No linked migration route is available for this model yet.
Frequently asked questions
What is the context window of GPT-4.5?
GPT-4.5 has a context window of 8k tokens.
When was GPT-4.5 released?
GPT-4.5 was released on 2025-02-27.
Which providers offer GPT-4.5?
GPT-4.5 is available from 2 providers: OpenAI API, Azure OpenAI.
What benchmarks has GPT-4.5 been tested on?
GPT-4.5 has been evaluated on 2 benchmarks, including MMLU PRO, Google-Proof Q&A.
Cheapest of 2 routes · Azure OpenAI