GPT-6.1 Sol Pro vs Claude Sonnet 5.5: API Pricing, Limits & Cost Delta
Side-by-side 2026 engineering comparison between OpenAI GPT-6.1 Sol Pro and Anthropic Claude Sonnet 5.5—covering uncached input, cached prefix reads, output rates, max completion tokens, and live 30-day workload savings.
Interactive Workload Cost Delta Simulator
Side-by-Side Unit Price & Capability Matrix
| Dimension | GPT-6.1 Sol Pro | Claude Sonnet 5.5 |
|---|---|---|
| Provider & Release Date | OpenAI (2026-09-29) | Anthropic (2026-09-28) |
| Primary Workload Tier | Frontier Reasoning | Frontier Reasoning |
| Uncached Input ($ / 1M tokens) | $2 | $2 |
| Cached Prompt Read ($ / 1M tokens) | $0.1 | $0.1 |
| Output Completion ($ / 1M tokens) | $10 | $10 |
| 50% Async Batch API | Supported | Supported |
| Context Window (tokens) | 1,050,000 | 1,000,000 |
| Max Output Tokens | 128,000 | 128,000 |
| Function / Tool Calling | Supported | Supported |
| Strict JSON Schema Outputs | Supported | Supported |
| Reasoning Token Mode | Supported | Supported |
| Accepted Input Modalities | text, file, image | text, image, file |
Decision Rubric: When to Pick GPT-6.1 Sol Pro vs Claude Sonnet 5.5
When to choose GPT-6.1 Sol Pro (OpenAI)
Select GPT-6.1 Sol Pro when your workload prioritizes its Frontier Reasoning profile ($2/1M input, $0.1/1M cached read, $10/1M output) with up to 1,050,000 context tokens and 128,000 max output tokens (50% Batch API supported).
GPT-6.1 Sol Pro full pricing sheet →When to choose Claude Sonnet 5.5 (Anthropic)
Select Claude Sonnet 5.5 when your workload prioritizes its Frontier Reasoning profile ($2/1M input, $0.1/1M cached read, $10/1M output) with up to 1,000,000 context tokens and 128,000 max output tokens (50% Batch API supported).
Claude Sonnet 5.5 full pricing sheet →Frequently Asked Questions
Is GPT-6.1 Sol Pro cheaper than Claude Sonnet 5.5 for production API workloads?
On standard uncached rates, GPT-6.1 Sol Pro bills $2/1M input and $10/1M output versus Claude Sonnet 5.5 at $2/1M input and $10/1M output. On a typical 1,000 calls/day workload (4,000 input tokens at 50% cache hit + 800 output tokens), GPT-6.1 Sol Pro saves $0.00/month (0% lower).
How do GPT-6.1 Sol Pro and Claude Sonnet 5.5 compare on context window and max output tokens?
GPT-6.1 Sol Pro offers a 1,050,000-token context window with 128,000 max output tokens (text, file, image), while Claude Sonnet 5.5 provides a 1,000,000-token context window with 128,000 max output tokens (text, image, file).
Can I switch between GPT-6.1 Sol Pro and Claude Sonnet 5.5 with strict JSON Schema tool calling?
Both models can be evaluated locally in DevToken: GPT-6.1 Sol Pro (tools: Supported, strict JSON Schema: Supported) vs Claude Sonnet 5.5 (tools: Supported, strict JSON Schema: Supported). Always verify rate-limit headroom in the 429 Calculator before cutover.