OpenAI vs Anthropic: Pricing & Model Comparison 2026
Compare OpenAI GPT-6 Astra and GPT-6.1 Sol with Anthropic Claude Opus 5.5 and Sonnet 5. Pricing, context windows, capabilities, and which to choose.
Last updated: October 2026
Pricing Comparison
| Model | Provider | Input $/1M | Output $/1M | Context | Max Output |
|---|---|---|---|---|---|
| GPT-6 Astra | OpenAI | $10 | $50 | 1.05M | 128K |
| Claude Opus 5.5 | Anthropic | $4 | $20 | 1M | 128K |
| GPT-6.1 Sol | OpenAI | $2 | $10 | 1.05M | 128K |
| Claude Sonnet 5.5 | Anthropic | $2 | $10 | 1M | 128K |
Detailed Comparison
GPT-6 Astra
OpenAI
$10 / $50
per 1M tokens
Strengths
- + Highest-capability OpenAI model
- + 1.05M token context window
- + Strong end-to-end computer and tool use
Best For
Complex multi-modal tasks, enterprise integrations
Context Window
1.05M
Max Output
128K
Claude Opus 5.5
Anthropic
$4 / $20
per 1M tokens
Strengths
- + Strong long-running agents and coding
- + 40% lower typical cost than Opus 5
- + 1M context at standard rates
Best For
Long-form content, complex coding, detailed analysis
Context Window
1M
Max Output
128K
GPT-6.1 Sol
OpenAI
$2 / $10
per 1M tokens
Strengths
- + 1.05M token context window
- + Strong coding and agent tier
- + 50% cheaper than GPT-5.6 Sol output
Best For
Demanding production coding and agent workflows
Context Window
1.05M
Max Output
128K
Claude Sonnet 5.5
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
128K
Verdict
GPT-6 Astra is the quality-first $10/$50 tier. Claude Opus 5.5 costs $4/$20 and is the stronger premium value baseline, while GPT-6.1 Sol and Claude Sonnet 5.5 both cost $2/$10. Evaluate cost per successful task, not token price alone.
Calculate Your Costs
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FAQ
Which is cheaper, GPT-6 Astra or Claude Opus 5.5?
GPT-6 Astra costs $10/$50 per million tokens (input/output), while Claude Opus 5.5 costs $4/$20. Claude Opus 5.5 is cheaper for input.
Which has a larger context window?
GPT-6 Astra supports 1.05M context, while Claude Opus 5.5 supports 1M. Larger context windows allow processing more text in a single request.
Which should I choose for my project?
GPT-6 Astra is the quality-first $10/$50 tier. Claude Opus 5.5 costs $4/$20 and is the stronger premium value baseline, while GPT-6.1 Sol and Claude Sonnet 5.5 both cost $2/$10. Evaluate cost per successful task, not token price alone.