Pairwise benchmark snapshot · Aug 17, 2026noindex (thin pair)
In this head-to-head showdown, OpenAI: GPT-5.3-Codex is more budget-friendly at $14/1M per 1M output tokens. Review the complete breakdown below to determine which model best fits your performance and budget requirements.
Anthropic current default flagship. Official API $5/$25 per 1M tokens and a 1M context window (Anthropic, Jul 24 2026).
Auto-discovered from OpenRouter (openai/gpt-5.3-codex). Preview until a second source matches.
Simulate accuracy gains vs added response time & token cost
Reasoning models “think before answering” by generating internal reasoning tokens. Higher effort improves math, coding, and logic accuracy, but increases response delay and token costs.
Single model data
No latency data
$14 / 1M output
Relative percentile scores computed across all active models in the benchmark catalog.
Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.
Category wins across reasoning intelligence, generation speed, and token cost.
Preference Elo, Coding proficiency, SWE-bench & LiveBench accuracy
Generation throughput and time to first token responsiveness
Cost per million tokens and max context window length
| Benchmark | Claude Opus 5 | OpenAI: GPT-5.3-Codex | Advantage Delta |
|---|---|---|---|
| Preference Elo | — | — | |
| Coding Elo | — | — | |
| LiveBench | — | — | |
| SWE-bench | — | — | |
| GPQA Diamond | — | — | |
| Time to first token | — | — | |
| Output speed | 72 tok/s | — | — |
| Input price | $1.75/1M | OpenAI: GPT-5.3-Codex (+$8.25/1M) | |
| Output price | OpenAI: GPT-5.3-Codex (+$36/1M) | ||
| Context window | Claude Opus 5 (+600k) |
Simulate monthly production API costs in USD (US Dollar).
OpenAI: GPT-5.3-Codex is estimated to save $828.75/month ($9,945/year).
Need SWE-bench on both sides.
Lower output list price ($14/1M).
Need TTFT on both sides.
Larger window (1M).
Claude Opus 5 is the side marked multimodal in the catalog.
| Target Workload | Recommended Pick | Evaluation Rationale |
|---|---|---|
| Repo / coding agents | insufficient data | Need SWE-bench on both sides. |
| High-volume chat | OpenAI: GPT-5.3-Codex | Lower output list price ($14/1M). |
| Voice / low-latency UI | insufficient data | Need TTFT on both sides. |
| Long-document RAG | Claude Opus 5 | Larger window (1M). |
| Screenshots / vision | Claude Opus 5 | Claude Opus 5 is the side marked multimodal in the catalog. |
Usually Sonnet 5 vs Opus 5. Coding delta versus output $/1M. The workhorse question.
Top Anthropic vs top Google. Usually Opus 5 vs 3.6 Pro. Two different invoices.
Not a frozen 2025 article. Today that is usually Opus 5 vs GPT-5.6 Sol. Dated cells, not a brand fight.
Jul 24 2026 official API at $5/$25 and a 1M window. Preference Elo is taste, not a coding exam.
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Verified head-to-head card
compare · Aug 10, 2026
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