Atlas / OpenAI / o3

o3

Reasoning-focused model using chain-of-thought for complex math, science, and coding problems.

Preview Reasoning Tools Vision

Current pricing

Input

$2.00

Output

$8.00

Cached input

$0.50

per 1M tokens Source ↗

Specifications

Context window

200K tokens

Max output

100K tokens

Knowledge cutoff

Oct 2025

Capabilities

✓ Function calling / Tools

✓ Image understanding

✓ Extended thinking / Reasoning

✗ Audio input/output

TierUnitInputCached inputOutputEffectiveSource

Standard Per 1M tokens $2.00 $0.50 $8.00 March 12, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 March 11, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 March 10, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 March 9, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 March 8, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 March 7, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 March 6, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 March 1, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 Feb. 22, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 Feb. 15, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 Feb. 8, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 Feb. 1, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 Jan. 25, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 Jan. 11, 2026 Source

Standard Per 1M tokens $2.00 $0.50 $8.00 Jan. 10, 2026 Source