Standard Compute
Model comparison 2026

Claude Haiku 5.5 vs GPT-5.3-Codex

Claude Haiku 5.5
Anthropic · Budget · Proprietary
$0.22/1M · 1M ctx
GPT-5.3-Codex
OpenAI · Balanced · Proprietary
$5.42/1M · 400K ctx

Community vote

Pick a winner in each dimension. You can change your vote any time.

Output Quality
Correctness and depth of what it produces
Agentic Ability
Tool calls, instruction-following, and multi-step tasks
Speed
Tokens per second and time-to-first-token
Value for money
How much capability you get per dollar
Reliability
Consistent results: fewer refusals, loops and format breaks

Specs and pricing side by side

Spec
Haiku 5.5
GPT-5.3-Codex
Maker
Anthropic
OpenAI
Blended price / 1M
$0.22
$5.42
Input / output
$0.10 in · $0.50 out / 1M tokens
$1.75 in · $14 out / 1M tokens
Context window
1M
400K
Open weights
No
No
Tool use
Yes
Yes
Reasoning
Yes
Yes
Output Quality
9.1
8.8
Agentic Ability
9.0
9.3
Speed
9.6
7.8
Value for money
9.4
7.8
Reliability
9.3
8.7

Pricing and capabilities synced from the OpenRouter catalogue. Scores are editorial (0–10).

Verdict: Haiku 5.5 or GPT-5.3-Codex?

Updated 2026-10-13

Choose Claude Haiku 5.5 if you want subagents, routing and high-volume steps that stay under 100K tokens per request. Choose GPT-5.3-Codex if you want codex CLI users and dedicated coding agents.

In our editorial scoring, Claude Haiku 5.5 leads in 4 of five dimensions (output quality, speed, value for money and reliability), while GPT-5.3-Codex leads in 1. On price, Claude Haiku 5.5 runs about $0.22 per 1M tokens (blended) and is proprietary; GPT-5.3-Codex is about $5.42 and proprietary.

Where Haiku 5.5 falls short
  • Prompts over 100K tokens cost 5x, on the whole request
  • New tokenizer counts about 30% more tokens than Haiku 4.5 for the same text
Full Haiku 5.5 breakdown →
Where GPT-5.3-Codex falls short
  • Narrower than a general flagship outside coding
  • Mid-tier pricing
Full GPT-5.3-Codex breakdown →

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