Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with improvements across sy…
Model details →Anthropic: Claude Sonnet 4.5 vs OpenAI: GPT-3.5 Turbo (older v0613)
Anthropic: Claude Sonnet 4.5 wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-3.5 Turbo is OpenAI's fastest model. It can understand and generate natural language or code, and is optimized for chat and traditional completion tasks. Training data up to Sep 2021.
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Sonnet 4.5 | OpenAI: GPT-3.5 Turbo (older v0613) | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 4K | 🏆 Anthropic: Claude Sonnet 4.5 |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $3.00 | $1.00 | 🏆 OpenAI: GPT-3.5 Turbo (older v0613) |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $15.00 | $2.00 | 🏆 OpenAI: GPT-3.5 Turbo (older v0613) |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | — | 🏆 Anthropic: Claude Sonnet 4.5 |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | — | 🏆 Anthropic: Claude Sonnet 4.5 |
Frequently asked questions
Is Anthropic: Claude Sonnet 4.5 better than OpenAI: GPT-3.5 Turbo (older v0613)?
Anthropic: Claude Sonnet 4.5 wins on 3 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Sonnet 4.5 and OpenAI: GPT-3.5 Turbo (older v0613)?
Input: $3.00 vs $1.00 per 1M tokens. Output: $15.00 vs $2.00 per 1M tokens.
What context windows do Anthropic: Claude Sonnet 4.5 and OpenAI: GPT-3.5 Turbo (older v0613) support?
Anthropic: Claude Sonnet 4.5 supports up to 1M tokens. OpenAI: GPT-3.5 Turbo (older v0613) supports up to 4K tokens.
Do both Anthropic: Claude Sonnet 4.5 and OpenAI: GPT-3.5 Turbo (older v0613) support tool calling?
Anthropic: Claude Sonnet 4.5: yes. OpenAI: GPT-3.5 Turbo (older v0613): yes.