GPT-5.2 Codex vs Claude Opus 5.5
Benchmarks, API Token Pricing, Context Window & Speed Comparison
Related topics (4)
Compare GPT-5.2 Codex by OpenAI against Claude Opus 5.5 by Anthropic across real-world coding, reasoning, token economics, and latency.
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GPT-5.2 Codex
高度な推論モデルOpenAI が提供する GPT-5.2 Codex は、最大 400K トークンのコンテキストウィンドウを備え、入力 $1.75/100万トークン・出力 $14/100万トークンで利用可能な、コーディング・推論・業務自動化向け AI モデルです。
$1.75 / 1M
$14.00 / 1M
400K tokens
78.1%
Claude Opus 5.5
高度な推論モデルAnthropic が提供する Claude Opus 5.5 は、最大 1M トークンのコンテキストウィンドウを備え、入力 $4.0/100万トークン・出力 $20.0/100万トークンで利用可能な、コーディング・推論・業務自動化向け AI モデルです。
$4.00 / 1M
$20.00 / 1M
1M tokens
84.6%
ひと目でわかる主な違い
- GPT-5.2 Codex is 1.6x cheaper for API usage (input + output tokens combined).
- Claude Opus 5.5 has a larger context window (1M vs 400K tokens).
- GPT-5.2 Codex is faster at 118 tok/s vs 78 tok/s.
- Claude Opus 5.5 leads on SWE-bench coding (84.6% vs 78.1%).
| Feature | GPT-5.2 Codex | Claude Opus 5.5 |
|---|---|---|
Intelligence Index Composite reasoning & knowledge score (0-100) | 66 | 94 |
Provider | OpenAI | Anthropic |
Input Price Cost per million input tokens | $1.75 / 1M | $4.00 / 1M |
Output Price Cost per million output tokens | $14.00 / 1M | $20.00 / 1M |
Blended Price Weighted 7:2:1 cache:input:output per 1M | $1.87 / 1M | $3.08 / 1M |
Context Window Maximum input + output tokens | 400K tokens~600 A4 pages of text | 1M tokens~1,500 A4 pages of text |
Max Output Tokens Per single request | 128K | 128K |
Throughput Speed Tokens generated per second | 118 tok/s | 78 tok/s |
SWE-bench Verified Real-world software engineering | 78.1% | 84.6% |
GPQA Diamond Graduate-level reasoning | 78.2% | 82.3% |
Cached Input Price Prompt caching discount per 1M tokens | $0.17 / 1M | $0.40 / 1M |
分野別勝者スコアカード
At-a-glance decision framework検証済みベンチマークスコア比較
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.
レイテンシ＆応答時間
Time to first token (TTFT) and estimated end-to-end response time for a typical 500-token response.
リアルタイムAPIトークン料金シミュレーター
Adjust sliders to calculate projected monthly cloud API spending with prompt caching discounts.
GPT-5.2 Codex · Strengths & Key Advantages
- OpenAI の高度な Code-specialised long-horizon reasoning model アーキテクチャと 400K トークンのコンテキスト処理能力
- 優れたコストパフォーマンス（入力 $1.75/1M、出力 $14/1M）と安定した応答速度
- プログラミング、論理的推論、多言語タスクにおいて高いベンチマーク精度を実現
Considerations & Trade-offs
- 大規模な長文コンテキスト処理時はトークン消費量の最適化が必要
- 専門領域のタスクでは適切なプロンプト設計や RAG の併用が推奨される
Claude Opus 5.5 · Strengths & Key Advantages
- Anthropic の高度な Extended Autonomous Hybrid Reasoning Transformer アーキテクチャと 1M トークンのコンテキスト処理能力
- 優れたコストパフォーマンス（入力 $4.0/1M、出力 $20.0/1M）と安定した応答速度
- プログラミング、論理的推論、多言語タスクにおいて高いベンチマーク精度を実現
Considerations & Trade-offs
- 大規模な長文コンテキスト処理時はトークン消費量の最適化が必要
- 専門領域のタスクでは適切なプロンプト設計や RAG の併用が推奨される
Token Use & Task Economics
Estimated cost and token consumption to complete one representative agentic task.
| Metric | GPT-5.2 Codex | Claude Opus 5.5 |
|---|---|---|
Cost per Task Estimated USD to finish one task | $2.20 | $3.85 |
Output Tokens / Task Tokens generated per task | 60K | 68K |
Reasoning Tokens / Task Thinking tokens burned per task | 34K | 42K |
技術仕様・スペック
Architecture, release timeline, capabilities, and modalities.
| Feature | GPT-5.2 Codex | Claude Opus 5.5 |
|---|---|---|
| Official API Model ID (SDK) | gpt-5-2-codex | claude-opus-5-5-20260901 |
| API Protocol | OpenAI Responses API & Chat Completions v1 | Anthropic Messages API + AWS Bedrock + Vertex AI |
| Release Date | 2025-12 | 2026-09 |
| Knowledge Cutoff | August 2025 | June 2026 |
| Architecture | Code-specialised long-horizon reasoning model | Extended Autonomous Hybrid Reasoning Transformer |
| 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 ($1.75/1M in) across full 400K window | Standard rate up to 200K tokens; 2x input/output tier above 200K tokens |
| Prompt Cache Policy & TTL | Automatic prefix caching at $0.175/1M (no extra cache-write fee) | $0.4/1M 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) | 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 | text, vision |
| Output Modalities | text | text |
GPT-5.2 Codex vs Claude Opus 5.5: よくある質問 (FAQ)
Which is more intelligent, GPT-5.2 Codex or Claude Opus 5.5?
Claude Opus 5.5 is more intelligent. It scores 94 compared with 66 on the composite Intelligence Index.
Which model is faster?
GPT-5.2 Codex is faster, generating 118 tokens per second compared with 78 tokens per second.
Which model is cheaper to run?
GPT-5.2 Codex is cheaper at $1.87 per 1M tokens blended, compared with $3.08 (7:2:1 cache:input:output ratio).
Which model has lower latency?
GPT-5.2 Codex has lower latency, with a time to first token of 1.28s compared with 1.40s.
Which model has a larger context window?
Claude Opus 5.5 has a larger context window, supporting 1M tokens compared with 400K tokens.
総合評価
Choose GPT-5.2 Codex for エンタープライズ自動化、ソフトウェア開発、ai エージェント構築、openai エコシステムの統合, or choose Claude Opus 5.5 for エンタープライズ自動化、ソフトウェア開発、ai エージェント構築、anthropic エコシステムの統合.
よくある質問 (FAQ)
Which is cheaper: GPT-5.2 Codex or Claude Opus 5.5?+
GPT-5.2 Codex costs $1.75/1M input and $14/1M output tokens, while Claude Opus 5.5 costs $4/1M input and $20/1M output tokens.
Which model has a larger context window: GPT-5.2 Codex or Claude Opus 5.5?+
GPT-5.2 Codex supports 400K tokens whereas Claude Opus 5.5 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.
公的ソース: OpenAI & Anthropic Official Documentation