Claude Opus 4.5 vs GPT-4 Turbo
Claude Opus 4.5 (2025) and GPT-4 Turbo (2024) are frontier reasoning models from Anthropic and OpenAI. Claude Opus 4.5 ships a 200K-token context window, while GPT-4 Turbo ships a 128K-token context window. On MMLU PRO, Claude Opus 4.5 leads by 19.5 pts. On pricing, Claude Opus 4.5 costs $5/1M input tokens versus $5/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
Pick Claude Opus 4.5 for general evaluation; GPT-4 Turbo is better when coding workflow support matters more.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-11-01 | 2024-04-09 |
| Context window | 200K | 128K |
| Parameters | — | 1.76T (8x222B MoE)* |
| Architecture | decoder only | mixture of experts |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-12 | 2023-12 |
Pricing and availability
| Pricing attribute | Claude Opus 4.5 | GPT-4 Turbo |
|---|---|---|
| Input price | $5/1M tokens | $5/1M tokens |
| Output price | $25/1M tokens | $15/1M tokens |
| Providers |
Capabilities
| Capability | Claude Opus 4.5 | GPT-4 Turbo |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
Benchmarks
| Benchmark | Claude Opus 4.5 | GPT-4 Turbo |
|---|---|---|
| MMLU PRO | 88.9 | 69.4 |
| Chatbot Arena | 1466.0 | 1242.0 |
Deep dive
On shared benchmark coverage, MMLU PRO has Claude Opus 4.5 at 88.9 and GPT-4 Turbo at 69.4, with Claude Opus 4.5 ahead by 19.5 points; Chatbot Arena has Claude Opus 4.5 at 1466 and GPT-4 Turbo at 1242, with Claude Opus 4.5 ahead by 224 points. The largest visible gap is 224 points on Chatbot Arena, 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: Claude Opus 4.5. 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 Opus 4.5 lists $5/1M input and $25/1M output tokens, while GPT-4 Turbo lists $5/1M input and $15/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts GPT-4 Turbo lower by about $3 per million blended tokens. Availability is 5 providers versus 5, so concentration risk also matters.
Choose Claude Opus 4.5 when coding workflow support and larger context windows are central to the workload. Choose GPT-4 Turbo 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 has a larger context window, Claude Opus 4.5 or GPT-4 Turbo?
Claude Opus 4.5 supports 200K tokens, while GPT-4 Turbo supports 128K 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 Opus 4.5 or GPT-4 Turbo?
Claude Opus 4.5 is cheaper on tracked token pricing. Claude Opus 4.5 costs $5/1M input and $25/1M output tokens. GPT-4 Turbo costs $5/1M input and $15/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Opus 4.5 or GPT-4 Turbo open source?
Claude Opus 4.5 is listed under Proprietary. GPT-4 Turbo 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 Opus 4.5 or GPT-4 Turbo?
Both Claude Opus 4.5 and GPT-4 Turbo 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 Opus 4.5 or GPT-4 Turbo?
Both Claude Opus 4.5 and GPT-4 Turbo 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 Opus 4.5 and GPT-4 Turbo?
Claude Opus 4.5 is available on Microsoft Foundry, Anthropic, GCP Vertex AI, AWS Bedrock, and OpenRouter. GPT-4 Turbo is available on OpenAI API, Azure OpenAI, Salesforce Einstein Generative AI, OpenRouter, and Replicate API. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-11. Data sourced from public model cards and provider documentation.