OpenAI vs Anthropic: Pricing & Model Comparison 2026
Compare OpenAI GPT-5.6 Sol and Terra with Anthropic Claude Opus 5 and Sonnet 5. Pricing, context windows, capabilities, and which to choose.
Last updated: August 2026
Pricing Comparison
| Model | Provider | Input $/1M | Output $/1M | Context | Max Output |
|---|---|---|---|---|---|
| GPT-5.6 Sol | OpenAI | $5 | $30 | 1.05M | 128K |
| Claude Opus 5 | Anthropic | $5 | $25 | 1M | 128K |
| GPT-5.6 Terra | OpenAI | $2 | $12 | 1.05M | 128K |
| Claude Sonnet 5 | Anthropic | $2 | $10 | 1M | 64K |
Detailed Comparison
GPT-5.6 Sol
OpenAI
$5 / $30
per 1M tokens
Strengths
- + Frontier OpenAI model for complex reasoning
- + 1.05M token context window
- + Extensive ecosystem and tooling
Best For
Complex multi-modal tasks, enterprise integrations
Context Window
1.05M
Max Output
128K
Claude Opus 5
Anthropic
$5 / $25
per 1M tokens
Strengths
- + Superior long-form writing quality
- + Excellent at coding and analysis
- + 1M context window for eligible orgs
Best For
Long-form content, complex coding, detailed analysis
Context Window
1M
Max Output
128K
GPT-5.6 Terra
OpenAI
$2 / $12
per 1M tokens
Strengths
- + 1.05M token context window
- + Reduced August pricing
- + Great for long document processing
Best For
Budget-friendly production workloads, long documents
Context Window
1.05M
Max Output
128K
Claude Sonnet 5
Anthropic
$2 / $10
per 1M tokens
Strengths
- + Best balance of speed and quality
- + Strong at coding tasks
- + Extended thinking capability
Best For
Everyday coding, fast iteration, balanced workloads
Context Window
1M
Max Output
64K
Verdict
GPT-5.6 Sol ($5/$30) and Claude Opus 5 ($5/$25) occupy the premium tier. GPT-5.6 Terra is now $2/$12, while Claude Sonnet 5 is $2/$10 through August 31. Compare scheduled and promotional changes before using these rates for later budgets.
Calculate Your Costs
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FAQ
Which is cheaper, GPT-5.6 Sol or Claude Opus 5?
GPT-5.6 Sol costs $5/$30 per million tokens (input/output), while Claude Opus 5 costs $5/$25. Claude Opus 5 is cheaper for input.
Which has a larger context window?
GPT-5.6 Sol supports 1.05M context, while Claude Opus 5 supports 1M. Larger context windows allow processing more text in a single request.
Which should I choose for my project?
GPT-5.6 Sol ($5/$30) and Claude Opus 5 ($5/$25) occupy the premium tier. GPT-5.6 Terra is now $2/$12, while Claude Sonnet 5 is $2/$10 through August 31. Compare scheduled and promotional changes before using these rates for later budgets.