GPT-5 vs Claude Sonnet 4.5
GPT-5 vs Claude Sonnet 4.5: GPT-5 is cheaper for input-heavy usage ($1.25/M vs $3.00/M input tokens), while GPT-5 is better for long-context tasks (1,000,000 tokens).
Direct answer: choose GPT-5 for lower token spend and choose GPT-5 when your workload needs longer context.
Compare input and output token pricing, context windows, and monthly cost estimates on one page so you can pick the cheaper model fast.
Cost Comparison (1000 input + 500 output tokens, 100 requests/day)
GPT-5
Claude Sonnet 4.5
Cost Differences
Claude Sonnet 4.5 costs more than GPT-5
Quick Recommendation
Winner for direct API pricing: GPT-5. At the default workload, GPT-5 saves about $12.75/month ($155.125/year) versus Claude Sonnet 4.5.
Feature Comparison
| Feature | GPT-5 | Claude Sonnet 4.5 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Input Price | $1.25/1M tokens | $3.00/1M tokens |
| Output Price | $10.00/1M tokens | $15.00/1M tokens |
| Context Window | 1,000,000 tokens | 200,000 tokens |
| Max Output | 131,072 tokens | 64,000 tokens |
| Category | flagship | balanced |
| Capabilities | textvisionaudiocode | textvisioncode |
| Release Date | 8/7/2025 | 9/29/2025 |
GPT-5 vs Claude Sonnet 4.5: Which Should You Choose?
Choosing between GPT-5 and Claude Sonnet 4.5 depends on your priorities: cost efficiency, context length, or raw capability. GPT-5 is the more affordable option at $1.25/1M input tokens — 58% cheaper than Claude Sonnet 4.5. Meanwhile, GPT-5 offers a significantly larger context window at 1,000,000 tokens vs 200,000 for Claude Sonnet 4.5.
These models come from different providers — OpenAI and Anthropic — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with OpenAI, switching to Anthropicinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.
These models target different tiers: GPT-5 is a flagship model while Claude Sonnet 4.5 is balanced. This means they're optimized for different workloads. GPT-5 is built for complex tasks that require deeper reasoning, while Claude Sonnet 4.5 offers better value for routine operations.
Output costs matter too. GPT-5 charges $10.00/1M output tokens vs $15.00 for Claude Sonnet 4.5. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. GPT-5 has the edge here at $10.00/1M output tokens.
Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.
Best Use Cases
Choose GPT-5 when:
- • Budget is a primary concern
- • You need a larger context window (1,000,000 tokens)
- • You need more capabilities (audio)
- • You need longer outputs (up to 131,072 tokens)
- • You're already using OpenAI's API ecosystem
Choose Claude Sonnet 4.5 when:
- • You're already using Anthropic's API ecosystem
Pros and Caveats at a Glance
GPT-5
- • Input pricing: $1.25/M tokens
- • Output pricing: $10.00/M tokens
- • Context window: 1,000,000 tokens
- • Max output: 131,072 tokens
Watch out for
- • Trade-offs are minor in this matchup.
Claude Sonnet 4.5
- • Input pricing: $3.00/M tokens
- • Output pricing: $15.00/M tokens
- • Context window: 200,000 tokens
- • Max output: 64,000 tokens
Watch out for
- • Higher input cost than GPT-5
- • Higher output cost than GPT-5
- • Smaller context window than GPT-5
Try Different Scenarios
Use the calculator below to see how costs change with different usage patterns
GPT-5 (OpenAI)
Claude Sonnet 4.5 (Anthropic)
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Sign Up for Anthropic →Frequently Asked Questions
Which is cheaper, GPT-5 or Claude Sonnet 4.5?▼
What is the context window difference between GPT-5 and Claude Sonnet 4.5?▼
Which model is better for AI Chatbot?▼
Which model has better overall pricing for heavy usage?▼
Where can I compare OpenAI and Anthropic API pricing beyond this model matchup?▼
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