GPT-6 Astra vs Claude Sonnet 4.5
Benchmarks, API Token Pricing, Context Window & Speed Comparison
Related topics (4)
Compare GPT-6 Astra by OpenAI against Claude Sonnet 4.5 by Anthropic across real-world coding, reasoning, token economics, and latency.
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GPT-6 Astra
Autonomous OS AgentOpenAI's late-2026 flagship foundation model featuring native Computer-Use agents, dynamic UI orchestration, and deep STEM reasoning.
$10.00 / 1M
$50.00 / 1M
272K tokens
82.4%
Claude Sonnet 4.5
Developer's ChoiceBalanced performance and speed for professional use. Excellent for coding and analytical tasks.
$3.00 / 1M
$15.00 / 1M
1M tokens
77.8%
Key Differences at a Glance
- Claude Sonnet 4.5 is 3.3x cheaper for API usage (input + output tokens combined).
- Claude Sonnet 4.5 has a larger context window (1M vs 272K tokens).
- GPT-6 Astra is faster at 100 tok/s vs 90 tok/s.
- GPT-6 Astra leads on SWE-bench coding (82.4% vs 77.8%).
| Feature | GPT-6 Astra | Claude Sonnet 4.5 |
|---|---|---|
Intelligence Index Composite reasoning & knowledge score (0-100) | 96 | 91 |
Provider | OpenAI | Anthropic |
Input Price Cost per million input tokens | $10.00 / 1M | $3.00 / 1M |
Output Price Cost per million output tokens | $50.00 / 1M | $15.00 / 1M |
Blended Price Weighted 7:2:1 cache:input:output per 1M | $7.70 / 1M | $2.31 / 1M |
Context Window Maximum input + output tokens | 272K tokens~408 A4 pages of text | 1M tokens~1,500 A4 pages of text |
Max Output Tokens Per single request | 128K | 64K |
Throughput Speed Tokens generated per second | 100 tok/s | 90 tok/s |
SWE-bench Verified Real-world software engineering | 82.4% | 77.8% |
GPQA Diamond Graduate-level reasoning | 80.9% | 70.2% |
Cached Input Price Prompt caching discount per 1M tokens | $1.00 / 1M | $0.30 / 1M |
Who Wins Where?
At-a-glance decision frameworkEmpirical Head-to-Head Benchmark Scores
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.
Latency & Response Time
Time to first token (TTFT) and estimated end-to-end response time for a typical 500-token response.
Real-Time Interactive Token Cost Simulator
Adjust sliders to calculate projected monthly cloud API spending with prompt caching discounts.
GPT-6 Astra · Strengths & Key Advantages
- Flawless OS-level navigation and Computer-Use automation
- Seamless real-time multimodal voice and vision interactivity
- Dynamic Chain-of-Thought that self-adjusts depth based on query difficulty
- Huge 1M context window with instant prefix caching
Considerations & Trade-offs
- Strict safety filters can occasionally throttle complex penetration testing prompts
- Slightly higher reasoning latency on high-effort math queries
Claude Sonnet 4.5 · Strengths & Key Advantages
- Top-tier code generation, debugging, and refactoring
- Faster and cheaper than Opus for technical work
- Strong function calling and agentic tool use
- 90% cached-input discount ($0.30 per 1M tokens)
Considerations & Trade-offs
- Lower peak reasoning than Opus 4.5 on the hardest tasks
- 200K context smaller than Gemini 3 Pro's 2M window
Token Use & Task Economics
Estimated cost and token consumption to complete one representative agentic task.
| Metric | GPT-6 Astra | Claude Sonnet 4.5 |
|---|---|---|
Cost per Task Estimated USD to finish one task | $2.15 | $2.10 |
Output Tokens / Task Tokens generated per task | 58K | 55K |
Reasoning Tokens / Task Thinking tokens burned per task | 32K | 30K |
Technical Specifications
Architecture, release timeline, capabilities, and modalities.
| Feature | GPT-6 Astra | Claude Sonnet 4.5 |
|---|---|---|
| Official API Model ID (SDK) | gpt-6-astra | claude-sonnet-4-5-20251101 |
| API Protocol | OpenAI Responses API & Chat Completions v1 | Anthropic Messages API + AWS Bedrock + Vertex AI |
| Release Date | 2026-09 | 2025-11 |
| Knowledge Cutoff | June 2026 | March 2025 |
| Architecture | Omni-Adaptive Autoregressive with Dynamic CoT | Hybrid Reasoning |
| Parameters | Confidential | Confidential |
| Enterprise Rate Limits (RPM / TPM) | 10,000 – 30,000 RPM (Tier 5 Enterprise) · 800,000 – 2,000,000 TPM | 4,000 – 10,000 RPM (Tier 4 + Priority Tier) · 4,000,000 – 10,000,000 TPM |
| Long-Context Tier (>128K/200K) | Flat rate ($10/1M in) across full 272K window | Standard rate up to 200K tokens; 2x input/output tier above 200K tokens |
| Prompt Cache Policy & TTL | Automatic prefix caching at $1/1M (no extra cache-write fee) | $0.3/1M cached read (90% off); 5-min default & 1-hour extended TTL |
| 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 Citations + Code Execution Tool + MCP Connectors |
| Official Fine-Tuning Support | Supervised Fine-Tuning (SFT), Direct Preference (DPO) & Reinforcement Fine-Tuning (RFT) | Custom Model Tuning via Amazon Bedrock & Prompt Distillation |
| Multimodal Token Billing | Text BPE (~4 chars/token) · Vision (~258–765 tokens per image tile) · Audio (~25–32 tokens/sec) | 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 | Anthropic RSP ASL-2 / ASL-3 Constitutional Safety Evaluated |
| 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, audio | text, vision |
| Output Modalities | text, audio | text |
GPT-6 Astra vs Claude Sonnet 4.5: Quick Answers
Which is more intelligent, GPT-6 Astra or Claude Sonnet 4.5?
GPT-6 Astra is more intelligent. It scores 96 compared with 91 on the composite Intelligence Index.
Which model is faster?
GPT-6 Astra is faster, generating 100 tokens per second compared with 90 tokens per second.
Which model is cheaper to run?
Claude Sonnet 4.5 is cheaper at $2.31 per 1M tokens blended, compared with $7.70 (7:2:1 cache:input:output ratio).
Which model has lower latency?
Claude Sonnet 4.5 has lower latency, with a time to first token of 0.90s compared with 0.95s.
Which model has a larger context window?
Claude Sonnet 4.5 has a larger context window, supporting 1M tokens compared with 272K tokens.
Verdict
Choose GPT-6 Astra for autonomous browser/computer workflows, real-time voice agents, and high-difficulty mathematical reasoning, or choose Claude Sonnet 4.5 for code generation, developer tools, api development, and cost-sensitive agentic engineering.
Frequently asked questions
Which is cheaper: GPT-6 Astra or Claude Sonnet 4.5?+
GPT-6 Astra costs $10/1M input and $50/1M output tokens, while Claude Sonnet 4.5 costs $3/1M input and $15/1M output tokens.
Which model has a larger context window: GPT-6 Astra or Claude Sonnet 4.5?+
GPT-6 Astra supports 272K tokens whereas Claude Sonnet 4.5 supports 1M tokens.
Understand key metrics like context window, token pricing, reasoning mode, and SWE-bench scores in our comprehensive AI glossary.
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Benchmark scores, token prices, and rate limits evolve rapidly as AI labs release model updates. Always verify current specifications and pricing on the official provider documentation.
Sources: OpenAI & Anthropic Official Documentation