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Beam 1.0 vs GPT-5 Codex

Beam 1.0 leads the LLM Stats Score 44.6 to 26.5.

Reflection AI · OpenAI · Updated for 2026

Which is better?

Beam 1.0 leads the overall LLM Stats Score 44.6 to 26.5, ranking #46 overall.

In the 1 individual benchmarks reported for both models, Beam 1.0 wins 1; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Beam 1.0

  • overall performance matters — it scores 44.6 and ranks #46 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Oct 2026
  • you need open weights you can self-host or fine-tune

Choose GPT-5 Codex

  • you are already invested in the OpenAI ecosystem

At a glance

The differences that matter most.

Beam 1.0
Reflection AI
GPT-5 Codex
OpenAI
Core performance indexes
LLM Stats Score
44.6
#46
26.5
#170
Reasoning
45.5
#37
26.4
#169
Coding
33.7
#39
19.3
#122
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$0.40 / M
— / M
Output price
$1.20 / M
— / M
Context window
1,048,576
—

Individual benchmarks

22 reported for Beam 1.0 · 1 for GPT-5 Codex

1 shared

Beam 1.0 outperforms in 1 benchmarks (SWE-Bench Verified), while GPT-5 Codex is better at 0 benchmarks.

Beam 1.0 significantly outperforms across most benchmarks.

Sat Oct 24 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Beam 1.0 specifies input context (1,048,576 tokens). Only Beam 1.0 specifies output context (131,072 tokens).

Reflection AI
Beam 1.0
Input1,048,576 tokens
Output131,072 tokens
OpenAI
GPT-5 Codex
Input- tokens
Output- tokens
Sat Oct 24 2026 • llm-stats.com

License

Usage and distribution terms

Beam 1.0 is licensed under Apache 2.0, while GPT-5 Codex uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

Beam 1.0

Apache 2.0

Open weights

GPT-5 Codex

Proprietary

Closed source

Release Timeline

When each model was launched

Beam 1.0 was released on 2026-10-16, while GPT-5 Codex was released on 2025-09-15.

Beam 1.0 is 13 months newer than GPT-5 Codex.

Beam 1.0

Oct 16, 2026

6 days ago

1.1yr newer
GPT-5 Codex

Sep 15, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

Beam 1.0 has a knowledge cutoff of 2026-06-30, while GPT-5 Codex has a cutoff of 2024-09-30.

Beam 1.0 has more recent training data (up to 2026-06-30), making it potentially better informed about events through that date compared to GPT-5 Codex (2024-09-30).

Beam 1.0

Jun 2026

1.8 yr newer
GPT-5 Codex

Sep 2024

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Beam 1.0 and GPT-5 Codex side-by-side, then vote on the output you prefer.

Beam 1.0
✓ Preferred
GPT-5 Codex
Open in Playground

FAQ

Common questions about Beam 1.0 vs GPT-5 Codex.

Which is better, Beam 1.0 or GPT-5 Codex?

Beam 1.0 leads the LLM Stats Score 44.6 to 26.5. Beam 1.0 is made by Reflection AI and GPT-5 Codex is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Beam 1.0 compare to GPT-5 Codex in benchmarks?

Beam 1.0 scores AIME 2026: 97.7%, GPQA: 90.6%, LiveCodeBench: 88.3%, SWE-Bench Verified: 81.6%, MCP Atlas: 80.8%. GPT-5 Codex scores SWE-Bench Verified: 74.5%.

What are the context window sizes for Beam 1.0 and GPT-5 Codex?

Beam 1.0 supports 1.0M tokens and GPT-5 Codex supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Beam 1.0 and GPT-5 Codex?

Key differences include LLM Stats Score (44.6 vs 26.5), licensing (Apache 2.0 vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Beam 1.0 and GPT-5 Codex?

Beam 1.0 is developed by Reflection AI and GPT-5 Codex is developed by OpenAI.

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