GPT-6 Luna Pro vs Claude Sonnet 5.5
Detailed technical comparison between GPT-6 Luna Pro (OpenAI) and Claude Sonnet 5.5 (Anthropic). Review live API token pricing, context window capabilities, time-to-first-token latency, and verified benchmark scores side-by-side.
Comparison Snapshot
GPT-6 Luna Pro
1,050,000 tokensTie
Equal CapabilityTie
Equal SpeedGPT-6 Luna Pro
$0.10 / MTokGPT-6 Luna Pro
GPT-6 Luna Pro is an advanced artificial intelligence model engineered by OpenAI. Tailored for complex multi-step reasoning, programming synthesis, and extended document comprehension, GPT-6 Luna Pro represents a key architectural iteration in the OpenAI model family. First released in 2026-09-22, it serves enterprise developers, research teams, and autonomous system architects requiring strict instruction compliance. Featuring an input capacity of 1,050,000 tokens (approximately 1,400 words), GPT-6 Luna Pro processes multi-file code repositories, lengthy technical reports, and complex prompts in a single inference call.
Claude Sonnet 5.5
Claude Sonnet 5.5 is an advanced artificial intelligence model engineered by Anthropic. Tailored for complex multi-step reasoning, programming synthesis, and extended document comprehension, Claude Sonnet 5.5 represents a key architectural iteration in the Anthropic model family. First released in 2026-09-28, it serves enterprise developers, research teams, and autonomous system architects requiring strict instruction compliance. Featuring an input capacity of 1,000,000 tokens (approximately 1,333 words), Claude Sonnet 5.5 processes multi-file code repositories, lengthy technical reports, and complex prompts in a single inference call.
Technical Specifications
🏆 = Superior Spec| Specification | GPT-6 Luna Pro | Claude Sonnet 5.5 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Context Window | 1,050,000 tokens🏆 | 1,000,000 tokens |
| Agent Suitability | Not yet benchmarked | Not yet benchmarked |
| Time to First Token (TTFT) | No public TTFT data | No public TTFT data |
| Deployment Model | managed api | managed api |
| Production Stability | Beta Access (est.) | Beta Access (est.) |
| API Available | Yes | Yes |
| Released Date | 2026-09-22 | 2026-09-28 |
API Pricing Comparison
Input Price per Million Tokens
GPT-6 Luna Pro
$0.10
Claude Sonnet 5.5
$2.00
Output Price per Million Tokens
GPT-6 Luna Pro
$0.50
Claude Sonnet 5.5
$10.00
💡 Cost Ratio: GPT-6 Luna Pro is 20.0x cheaper per input token than Claude Sonnet 5.5.
Want to test both models live?
Run side-by-side prompt benchmarks in our dynamic multi-model Sandbox. Compare execution speeds, latency metrics, and compute actual costs in real-time.
Benchmark Performance Metrics
Standardized Scores (0–100%)Scores show verified raw accuracy percentages across standardized AI evaluation suites. Higher bars indicate superior performance in that domain.
GPT-6 Luna Pro Quirks & Gotchas
No developer gotchas reported.
Claude Sonnet 5.5 Quirks & Gotchas
No developer gotchas reported.
Explore Other Popular Comparisons
GPT-6 Luna Pro vs Claude Haiku 5.5
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWGPT-6 Luna Pro vs Nano Banana 2.1
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWGPT-6 Luna Pro vs Mistral Large 4
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWGPT-6 Luna Pro vs Ling 3.1 Flash
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWGPT-6 Luna Pro vs GPT-6.1 Sol
Compare context windows, live API token prices, and benchmark scores.
SIDE-BY-SIDE REVIEWGPT-6 Luna Pro vs GPT-6.1 Sol Pro
Compare context windows, live API token prices, and benchmark scores.