GPT-5.5 vs GPT-5.6 Sol
Benchmarks, API Token Pricing, Context Window & Speed Comparison
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GPT-5.5 by OpenAI and GPT-5.6 Sol by OpenAI represent two of the frontier AI models analyzed in our comprehensive 2026 AI benchmark and LLM comparison. In this head-to-head evaluation, we examine API token pricing, context window specifications, inference speed (tokens per second), and empirical reasoning performance. From a pure economic perspective, GPT-5.6 Sol holds a notable pricing advantage for token ingestion. On output generation, GPT-5.6 Sol is more economical per million generated tokens. In data-heavy architectures requiring extensive repository or document analysis, both models provide an identical memory horizon with 1,050K tokens. In latency-sensitive production environments, GPT-5.5 leads in tokens-per-second throughput, making it ideal for real-time conversational agents and high-concurrency workflows. Below is the complete empirical head-to-head breakdown across cost, speed, context, and capability matrices.
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GPT-5.5
GPT de frontera predeterminadoel default de frontera GPT para codificación, computer use, investigación y knowledge trabajo.
$5.00 / 1M
$30.00 / 1M
1.05M tokens
81%
GPT-5.6 Sol
Frontera 5.6el insignia GPT-5.6 nivel para complejo profesional trabajo, codificación y flujos de trabajo agénticos.
$4.00 / 1M
$20.00 / 1M
1.05M tokens
83.8%
Diferencias Clave de un Vistazo
- GPT-5.6 Sol is 1.4x cheaper for API usage (input + output tokens combined).
- GPT-5.5 is faster at 112 tok/s vs 108 tok/s.
- GPT-5.6 Sol leads on SWE-bench coding (83.8% vs 81.0%).
| Característica | GPT-5.5 | GPT-5.6 Sol |
|---|---|---|
Intelligence Index Composite reasoning & knowledge score (0-100) | 84 | 89 |
Provider | OpenAI | OpenAI |
Input Price Cost per million input tokens | $5.00 / 1M | $4.00 / 1M |
Output Price Cost per million output tokens | $30.00 / 1M | $20.00 / 1M |
Blended Price Weighted 7:2:1 cache:input:output per 1M | $4.35 / 1M | $3.08 / 1M |
Context Window Maximum input + output tokens | 1.05M tokens~1,575 A4 pages of text | 1.05M tokens~1,575 A4 pages of text |
Max Output Tokens Per single request | 128K | 128K |
Throughput Speed Tokens generated per second | 112 tok/s | 108 tok/s |
SWE-bench Verified Real-world software engineering | 81% | 83.8% |
GPQA Diamond Graduate-level reasoning | 80% | 82% |
Cached Input Price Prompt caching discount per 1M tokens | $0.50 / 1M | $0.40 / 1M |
¿Quién gana en cada área?
At-a-glance decision frameworkPuntuaciones de Benchmarks Verificadas
Official evaluation metrics verified by independent third-party research labs.
Industry benchmark evaluating real-world GitHub issue resolution and multi-file debugging.
Challenging questions created by domain experts to test complex PhD-level reasoning.
Hardened reasoning and academic knowledge benchmark with reduced lucky-guess probability.
Crowdsourced human preference evaluation based on blind, head-to-head model battles.
Extremely difficult, closed-ended questions spanning the frontier of human expert knowledge.
Autonomous multi-step tasks executed inside a real command-line terminal environment.
Research-grade coding problems drawn from real scientific and numerical workloads.
Contamination-free competitive programming problems collected continuously over time.
American Invitational Mathematics Examination — multi-step Olympiad-level reasoning.
Accuracy when reasoning over very large inputs that fill the model context window.
Tokens emitted per second during active generation streaming.
Latencia y Tiempo de Respuesta
Time to first token (TTFT) and estimated end-to-end response time for a typical 500-token response.
Simulador Interactivo de Costos de Tokens
Adjust sliders to calculate projected monthly cloud API spending with prompt caching discounts.
GPT-5.5 · Strengths & Key Advantages
- mejor-en-clase de largo alcance agentic reliability
- 1M-token contexto con solid recall
- sólido codificación, investigación y uso de computadora rendimiento
- mejor-en-clase reliability para largo autónomo se ejecuta
Considerations & Trade-offs
- Roughly twice el precio de GPT-5.4
- salida precios makes alto-volumen use expensive
GPT-5.6 Sol · Strengths & Key Advantages
- superior del GPT-5.6 family en codificación y análisis
- Cheaper que GPT-5.5 despite mejor results
- sólido de contexto largo agentic rendimiento
- Cheaper que GPT-5.5 mientras que scoring mayor
Considerations & Trade-offs
- Still un premium precio por salida token
- Marginal gains sobre GPT-5.5 en short tareas
Token Use & Task Economics
Estimated cost and token consumption to complete one representative agentic task.
| Metric | GPT-5.5 | GPT-5.6 Sol |
|---|---|---|
Cost per Task Estimated USD to finish one task | $3.90 | $3.30 |
Output Tokens / Task Tokens generated per task | 64K | 64K |
Reasoning Tokens / Task Thinking tokens burned per task | 37K | 38K |
Especificaciones Técnicas
Architecture, release timeline, capabilities, and modalities.
| Característica | GPT-5.5 | GPT-5.6 Sol |
|---|---|---|
| Official API Model ID (SDK) | gpt-5-5 | gpt-5-6-sol |
| API Protocol | OpenAI Responses API & Chat Completions v1 | OpenAI Responses API & Chat Completions v1 |
| Release Date | 2026-04 | 2026-07 |
| Knowledge Cutoff | December 2025 | February 2026 |
| Architecture | Default frontier unified reasoning model | Frontier unified reasoning model |
| Parameters | Confidential | Confidential |
| Enterprise Rate Limits (RPM / TPM) | 10,000 – 30,000 RPM (Tier 5 Enterprise) · 4,000,000 – 10,000,000 TPM | 10,000 – 30,000 RPM (Tier 5 Enterprise) · 4,000,000 – 10,000,000 TPM |
| Long-Context Tier (>128K/200K) | Flat rate ($5/1M in) across full 1050K window | Flat rate ($4/1M in) across full 1050K window |
| Prompt Cache Policy & TTL | Automatic prefix caching at $0.5/1M (no extra cache-write fee) | Automatic prefix caching at $0.4/1M (no extra cache-write fee) |
| Computer Use / GUI Agent | Supported (Screen coordinate grounding, browser & desktop GUI action loops) | Supported (Screen coordinate grounding, browser & desktop GUI action loops) |
| MCP & Parallel Tool Calling | Native MCP Client/Server ready · Parallel function calling · 100% Strict JSON Schema | Native MCP Client/Server ready · Parallel function calling · 100% Strict JSON Schema |
| Web Search Grounding & Sandbox | Native Web Search tool + Hosted Code Interpreter & File Search RAG | Native Web Search tool + Hosted Code Interpreter & File Search RAG |
| Official Fine-Tuning Support | Supervised Fine-Tuning (SFT), Direct Preference (DPO) & Reinforcement Fine-Tuning (RFT) | Supervised Fine-Tuning (SFT), Direct Preference (DPO) & Reinforcement Fine-Tuning (RFT) |
| Multimodal Token Billing | Text BPE (~4 chars/token) · Vision (~258–765 tokens per image tile) | Text BPE (~4 chars/token) · Vision (~258–765 tokens per image tile) |
| Quantization & Min GPU VRAM | Cloud-Hosted Proprietary (FP8 / BF16 Tensor Core Cluster) · Zero Local VRAM Required (100% Serverless Cloud API) | Cloud-Hosted Proprietary (FP8 / BF16 Tensor Core Cluster) · Zero Local VRAM Required (100% Serverless Cloud API) |
| Safety & Frontier Classification | OpenAI Preparedness Framework Audited & System Card Published | OpenAI Preparedness Framework Audited & System Card Published |
| Enterprise Compliance (ZDR/HIPAA/SOC2) | SOC2 Type II · GDPR · Zero Data Retention (ZDR) & HIPAA BAA Available on Enterprise Tier | SOC2 Type II · GDPR · Zero Data Retention (ZDR) & HIPAA BAA Available on Enterprise Tier |
| Input Modalities | text, vision | text, vision |
| Output Modalities | text | text |
GPT-5.5 vs GPT-5.6 Sol: Respuestas Rápidas (FAQ)
Which is more intelligent, GPT-5.5 or GPT-5.6 Sol?
GPT-5.6 Sol is more intelligent. It scores 89 compared with 84 on the composite Intelligence Index.
Which model is faster?
GPT-5.5 is faster, generating 112 tokens per second compared with 108 tokens per second.
Which model is cheaper to run?
GPT-5.6 Sol is cheaper at $3.08 per 1M tokens blended, compared with $4.35 (7:2:1 cache:input:output ratio).
Which model has lower latency?
GPT-5.5 has lower latency, with a time to first token of 1.18s compared with 1.21s.
Veredicto
Verdict & Model Selection Recommendation: Choose GPT-5.5 if your priority is Frontier agents and demanding professional knowledge work. Its performance in demanding tasks justifies its operational token cost. Choose GPT-5.6 Sol if your workflow prioritizes Complex professional work and agentic coding pipelines. For large-scale batch processing or customer-facing conversational interfaces, its balance of speed and economics delivers superior ROI.
Preguntas frecuentes
How does GPT-5.5 compare to GPT-5.6 Sol in API token pricing and cost per token?+
GPT-5.5 costs $5.00 per 1M input tokens and $30.00 per 1M output tokens, whereas GPT-5.6 Sol costs $4.00 input and $20.00 output. Overall, GPT-5.6 Sol is the more cost-effective model for high-volume API pipelines. Both models support prompt caching discounts of up to 90% for repeated prompt prefixes.
Which model has a larger context window: GPT-5.5 or GPT-5.6 Sol?+
Both GPT-5.5 and GPT-5.6 Sol offer an identical context window of 1,050K tokens (~788k words). Both architectures provide equal capacity for large document ingestion, multi-file codebases, and extended multi-turn conversation histories.
Which AI model is better for software engineering and coding: GPT-5.5 or GPT-5.6 Sol?+
GPT-5.5 scores 81% on SWE-bench Verified while GPT-5.6 Sol scores 83.8%. For autonomous software engineering and multi-file debugging, GPT-5.6 Sol holds the verified benchmark lead.
What is the difference in reasoning capability and extended thinking between GPT-5.5 and GPT-5.6 Sol?+
GPT-5.5 features native chain-of-thought extended thinking mode with configurable reasoning effort. In contrast, GPT-5.6 Sol provides chain-of-thought reasoning depth for complex math and science.
How does inference speed (tokens per second) compare between GPT-5.5 and GPT-5.6 Sol?+
GPT-5.5 generates approximately 112 tokens per second, while GPT-5.6 Sol delivers 108 tokens per second. In latency-sensitive production environments, GPT-5.5 provides faster time-to-first-token (TTFT) and higher streaming response velocity.
Can you implement a tiered LLM routing setup combining GPT-5.5 and GPT-5.6 Sol to optimize costs?+
Yes! High-efficiency architectures route high-frequency routine classification and conversational tasks to GPT-5.6 Sol to save operational costs, and dynamically escalate complex architectural queries or reasoning tasks to GPT-5.5. This tiered routing pattern cuts overall API bills by up to 70%.
Understand key metrics like context window, token pricing, reasoning mode, and SWE-bench scores in our comprehensive AI glossary.
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Las puntuaciones de benchmarks, precios por token y límites de tasa evolucionan rápidamente. Verifique siempre las especificaciones actuales en la documentación oficial del proveedor.
Fuentes: GetInfoUs Independent AI Benchmarks & Official API Specs