Pairwise benchmark snapshot · Aug 17, 2026noindex (thin pair)
This page compares Claude Fable 5 (Anthropic) and OpenAI: GPT-5.3-Codex (OpenAI) using the latest snapshots we have as of Aug 17, 2026. OpenAI: GPT-5.3-Codex wins on output price at $14/1M. Claude Fable 5 has the larger context window (1M tokens). Every cell below is a dated snapshot from a named public source — we do not invent missing scores, and we do not run SWE-bench ourselves.
Anthropic
Claude Fable 5Anthropic top-tier long-horizon model. Official API $10/$50 per 1M tokens (Claude Platform pricing, Aug 2026).
OpenAI
OpenAI: GPT-5.3-CodexAuto-discovered from OpenRouter (openai/gpt-5.3-codex). Preview until a second source matches.
thinking_budgetReasoning models scale test-time compute by generating hidden chain-of-thought (CoT) tokens. These tokens are billed at standard output rates and directly expand latency (TTFT) in exchange for higher GPQA Diamond and SWE-bench Verified problem resolve rates.
Official evaluation benchmark budget for SWE-bench and LiveBench.
"thinking": {
"type": "enabled",
"budget_tokens": 16384
}"reasoning": {
"effort": "medium",
"max_tokens": 3200
}Instant pairwise benchmark recalculation across 400+ LLMs
Category wins across intelligence, speed, and pricing efficiency.
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
Each spoke is a skill. Farther from the center is better (0–100th percentile). Tap any dot to inspect details.
No shared data
No shared data
$36.00/1M cheaper
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 Fable 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 Fable 5 | Larger window (1M). |
| Screenshots / vision | Claude Fable 5 | Claude Fable 5 is the side marked multimodal in the catalog. |
No comments posted on this matchup yet. Be the first to share an evaluation note!
The real PNG is generated at /compare/claude-fable-5-vs-gpt-5-3-codex/opengraph-image for crawlers.
Verified head-to-head card